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

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

Removed link "importing to gitlab" because it's in "Documentation". Organized links in alphabetical order.

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>