Rugged seemed to stop accepting branch names as valid refs, throwing `Rugged::ReferenceError` exceptions. Now the branch target rather than branch name is used, and the default branch's hash is also calculated, and these work properly.

This used to work and might be something worth re-investigating in the future.

Don't show project fork event as imported

See merge request !1949

Add authorization to new branch/tag pages.

The create actions have authorization, the new actions didn't,
so no-one unauthorized could actually do anything, but it was wrong(TM).

See merge request !1979

Update .ruby-version to 2.1.7

Fixes #3835

See merge request !1980

fixes #3263 slashes are replaced with two underscores



See merge request !1981

Fixed invalid link on starred projects dashboard.

Fixes #3468

The MR fixes 'Project' links on a dashboard pages headers. See the issue for the details.

This MR does not include tests since the change is rather trivial and there are no (as far as I have seen) existing tests for checking links validity.

In case tests are required I would like to get some guidance on the implementation first. At least I would like to know what should be covered: changed links, all header links, all navigation?

See merge request !1926

UI: Use new style for wiki

Depends on !1953

See the commits for more details, the messages mostly speak for themselves.

# Highlights

## Wiki Page

Before:

![Screen_Shot_2015-12-02_at_17.48.45](/uploads/aa53f768b8760f2e15d765e06d5ff773/Screen_Shot_2015-12-02_at_17.48.45.png)

After:

![Screen_Shot_2015-12-02_at_17.48.16](/uploads/f8a376651aff9c8de82621578aaeb002/Screen_Shot_2015-12-02_at_17.48.16.png)

## Edit Wiki Page

Before:

![Screen_Shot_2015-12-02_at_17.48.59](/uploads/c9ffddaca3156046b99cba11bdb0ea4f/Screen_Shot_2015-12-02_at_17.48.59.png)

After:

![Screen_Shot_2015-12-02_at_17.48.26](/uploads/1aa62049f120c91436ed68fd7441c156/Screen_Shot_2015-12-02_at_17.48.26.png)

See merge request !1967

UI: New Project form tweaks

Depends on !1953 

See the commits for more details, the messages mostly speak for themselves.

Before:

![Screen_Shot_2015-12-02_at_17.43.23](/uploads/302e734f6796a85a9f4be9c2f494869d/Screen_Shot_2015-12-02_at_17.43.23.png)

After:

![Screen_Shot_2015-12-02_at_17.44.11](/uploads/411980e53a4f87cf0a04e5bcb7329f82/Screen_Shot_2015-12-02_at_17.44.11.png)


See merge request !1964

UI: Issuable filter tweaks

Depends on !1953

See the commits for more details, the messages mostly speak for themselves.

# Highlights

## Filter bar

Before:

![filter_before](/uploads/b061be7521c6d5babb77c7d12e77f65e/filter_before.png)

After:

![filter_after](/uploads/aadfbcd77caf1b49fde8ca6d781f1004/filter_after.png)

## Bulk edit bar

Before:

![bulk_before](/uploads/849c98224e1f335c65c0de5616bbcdae/bulk_before.png)

After:

![bulk_after](/uploads/185d29116663f9f663acab76d328096f/bulk_after.png)


See merge request !1963

Touch project when toggling stars to update cache

This is a fix for gitlab-org/gitlab-ce#3513.

When a star toggle event happens, we touch project to clear cache key.
This will trigger a new "updated_at" at the project model. If it's undesirable, please let me know and I will try to solve it in a different way.

See merge request !1970

Fixes #3468

UI: Issuable list item tweaks

Depends on !1953

See the commits for more details, the messages mostly speak for themselves.

Before:

![Screen_Shot_2015-12-02_at_17.37.40](/uploads/00ac22d131c49ce548bccd96866cbc75/Screen_Shot_2015-12-02_at_17.37.40.png)

After:

![merge_item_after](/uploads/201d742494596c50bbdb3626f06f65a8/merge_item_after.png)

Fixes https://dev.gitlab.org/gitlab/gitlabhq/issues/2590 and https://dev.gitlab.org/gitlab/gitlabhq/issues/2589

See merge request !1962

UI: Use new style for milestone detail page

Depends on !1953

See the commits for more details, the messages mostly speak for themselves.

Before:

![Screen_Shot_2015-12-02_at_17.47.03](/uploads/62441f50963e0c5d6d04b065573c05f0/Screen_Shot_2015-12-02_at_17.47.03.png)

After:

![Screen_Shot_2015-12-02_at_17.47.22](/uploads/ab29ac0c1819415cc647be173f8c92bd/Screen_Shot_2015-12-02_at_17.47.22.png)


See merge request !1966

UI: Project home panel tweaks

Depends on !1953

See the commits for more details, the messages mostly speak for themselves.

Before:

![Screen_Shot_2015-12-02_at_17.46.01](/uploads/f07a4f2370c6863a68df46f655b513c4/Screen_Shot_2015-12-02_at_17.46.01.png)

After:

![Screen_Shot_2015-12-02_at_17.45.40](/uploads/da9b19d3bd89b9421457e0df550efd6e/Screen_Shot_2015-12-02_at_17.45.40.png)


See merge request !1965

The Procfile is for development only



See merge request !1950

UI: Award emoji tweaks

Before:

![emoji_before](/uploads/82786924d3cea0313321b9dde0356cd2/emoji_before.png)

After:

![emoji_after](/uploads/07e94401701d7a622c3ed5cbaa148244/emoji_after.png)

See merge request !1960

Fix failures in master



See merge request !1974

Git rid of deprecated warnings after rails update

https://gitlab.com/gitlab-org/gitlab-ce/issues/3798

https://gitlab.com/gitlab-org/gitlab-ce/issues/3797

See merge request !1946

Fix broken spec related to MySQL and fractional seconds support.



See merge request !1973