Revert "Preload lib/"

This reverts commit 5511a731.

The original commit added this because it also enabled threadsafety, a change which was itself later reverted in 66d6c809, but this got left behind.

I don't fully understand the reasoning behind it so if I'm wrong, please tell me.

My reasoning for reverting it is that it messes with Rails' (and by extension Spring's) class reloading during development. When I was working in `lib/gitlab/markdown` and had to stop and restart the server every time I made a change, I didn't know it at the time, but this was why. That was a huge pain point.

If it's needed for production perhaps we could add a `if Rails.env.production?` clause around it so that it doesn't mess with development.

See merge request !1758

Update redcarpet to 3.2.3

Closes #2211

See merge request !1756

This option defaults to true in RedCarpet 3.2.0, but we handle
sanitization later in the process with html-pipeline.

Closes #2211

These files don't match their naming convention, but for organizational
purposes it makes sense.

Lets Rails autoload these files by name

This reverts commit 5511a731.

Fix bug where Wiki pages that include a '/' were no longer accessible

### What does this MR do?

This MR fixes a regression that caused Wiki pages that included a '/' to no longer be accessible.

### Are there points in the code the reviewer needs to double check?

Are there cases that `wiki_helper.rb` doesn't handle?

### Why was this MR needed?

The upgrade from Rails v4.1.2 to v4.1.9 (76aad9b7) caused slashes in a model ID to be escaped automatically. We can no longer use the built-in the URL helpers to generate the links for Wiki pages if we want to maintain support for slashes. There is no option to tell the formatter otherwise:

http://stackoverflow.com/questions/25031791/rails-4-1-2-to-param-escapes-slashes-and-breaks-app

The Rails code in question is here:

https://github.com/rails/rails/blob/4-1-stable/actionpack/lib/action_dispatch/journey/visitors.rb#L159

### What are the relevant issue numbers / [Feature requests](http://feedback.gitlab.com/)?

#1363

See merge request !502

Move project file links to tab bar.

The sidebar was getting awfully crowded, so I moved the file links to the tab bar alongside Activity and Readme. Unlike Readme, these files are not actually loaded in a tab, but simply link to the relevant blob, because we don't want to unnecessarily load the potentially large changelog or contribution guide on every project page load.

![Screen_Shot_2015-04-06_at_15.04.21](https://gitlab.com/gitlab-org/gitlab-ce/uploads/962e8073ab6dc8797f93ee754eb275ed/Screen_Shot_2015-04-06_at_15.04.21.png)

See merge request !497

Corrected steps for creating a patch release

Added step to bump all versions (CE, EE, CI) every time there is a patch release and the reasoning behind it

See merge request !1754

Make the "New Application" form's error messages visible

Prior, if you submit the form without values the error text and the form fields were white-on-white:

![Screen_Shot_2015-04-01_at_8.25.56_PM](https://dev.gitlab.org/gitlab/gitlabhq/uploads/17eb44e65fc9c5ddd4a529e3927cd9b6/Screen_Shot_2015-04-01_at_8.25.56_PM.png)

After:

![Screen_Shot_2015-04-06_at_10.13.07_PM](https://dev.gitlab.org/gitlab/gitlabhq/uploads/be53d6971ec1c34f415e75a0307b6577/Screen_Shot_2015-04-06_at_10.13.07_PM.png)

See merge request !1752

Render a 404 when RefsController#logs_tree gets an HTML request

Fixes #2152

See merge request !1748

Improve wording below signup box

Before:

![Screen_Shot_2015-04-07_at_5.46.31_PM](https://dev.gitlab.org/gitlab/gitlabhq/uploads/a5433c7c423fd37cffe4c2352a833dcf/Screen_Shot_2015-04-07_at_5.46.31_PM.png)

After:

![Screen_Shot_2015-04-07_at_5.45.05_PM](https://dev.gitlab.org/gitlab/gitlabhq/uploads/46e13756a8dc389e6f87de0097433e36/Screen_Shot_2015-04-07_at_5.45.05_PM.png)

See merge request !1755

Typo -- findAndollowLink -> findAndFollowLink

Pushed here to get working CI.

See merge request !1750

add necessary dir for uploads in update to 6.7

Documentation on how to fork a project

Added documentation on how to fork a project.

/cc @sabba

See merge request !1623

[ci skip]

Added step to bump all versions (CE, EE, CI) every time there is a patch release and the reasoning behind it

Closes #1363

Lower the pointHitDetectionRadius for commit charts

Needed to update the Chart.js dependency as well.

Fixes #2088

See merge request !1749

Add icons to Add dropdown items.

Before:

![Screen_Shot_2015-04-06_at_15.15.44](https://gitlab.com/gitlab-org/gitlab-ce/uploads/a9f7d2e5dbd604fe7dff03cd7e47860e/Screen_Shot_2015-04-06_at_15.15.44.png)

After:

![Screen_Shot_2015-04-06_at_15.15.34](https://gitlab.com/gitlab-org/gitlab-ce/uploads/c5be6cdbe32d1064da7497a1879a9eb3/Screen_Shot_2015-04-06_at_15.15.34.png)

See merge request !498

Fix final line in EmailsOnPush email diff being rendered as error.

Fixes https://github.com/gitlabhq/gitlabhq/issues/8976 and private issue https://dev.gitlab.org/gitlab/gitlabhq/issues/2194.

Pulls in gitlab_git 7.1.5, which includes https://gitlab.com/gitlab-org/gitlab_git/merge_requests/18.

See merge request !480

Add event to activity feed for imported projects.

![Screen_Shot_2015-04-06_at_14.51.16](https://gitlab.com/gitlab-org/gitlab-ce/uploads/07fd16cb558873d2a6fb6c3cfcfdb227/Screen_Shot_2015-04-06_at_14.51.16.png)

See merge request !496

Fixes #2088