Changes back-ported from rspec3 branch

This is just breaking up the large `road-to-rspec-3` branch a bit. Each of these commits have been cherry-picked and would be good to have in place before the upgrade.

See merge request !792

update fog to 1.25.0 and add multipart upload support

This merge will fix backup uploading problems to s3, closing gitlab-org/gitlab-ce#1059

See merge request !789

fixed links

@job I am trying to fix these links, since they work on the commit, but then they didn't work on the website when the commit was merged.

I tried changing them here, but I'm not sure if they'll work when merged. I tried to use localhost to test this, but it only works with www-gitlab-com

Thanks!

See merge request !1849

Update browser gem to version 0.8.0

Internet Explorer 11.0.9600.17633 has a new User-Agent string (tested using [BrowserStack](https://www.browserstack.com)):

```
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko
```

This is supported in v0.8.0 of the browser gem:

https://github.com/fnando/browser/commit/aab7a81d94cc2c31c4b860fa4a9b9a361adf1bab

Closes #1775

See merge request !791

They're called constants for a reason, after all.

This might see a minor speedup in test cases that call this method many
times.

As of Ruby 1.9, this is the correct way to handle `respond_to?` for
methods implemented by `method_missing`.

See https://robots.thoughtbot.com/always-define-respond-to-missing-when-overriding

Closes #1775

set the release time

See merge request !1843

Move Project Members link from Settings to main menu.

Addresses #2278.

See merge request !1846

Revert "No need to check if `repository_ref` is present"

Addresses #2278.

Make submit hotkey available to all notes forms.

Addresses #2221.

See merge request !1847

Add "Remember me" checkbox to LDAP signin form.

Addresses internal issue https://dev.gitlab.org/gitlab/gitlabhq/issues/2127.

See merge request !772

Move page-specific JS out of head and into body.

Addresses internal issue https://dev.gitlab.org/gitlab/gitlabhq/issues/2375.

See merge request !787

Correctly remove already-mentioned commits for cross references

Fixes #1778

See merge request !785

Fixing importing doc

Fixed some details about the importing links and documents.

- Added extra info to Bitbucket importing
- Organized docs in alphabetical order
- Moved Importing link to general documentation, instead of workflow (that's where Sytse asked me to add it)

Thank you @job for merging previous changes.

See merge request !1845

Added line about adding docs in alphabetical order

I believe it's important to be organized when adding documentation, so whenever it applies, I believe documents should be added in alphabetical order.

See merge request !786

No need to check if `repository_ref` is present

Addresses #2221.

Fixes #1778