Update SourceGithub and core versions

CSS improve layout with 'spacer' class for div

Remove calls to helper_alternate_class()

Github: fix broken link for Browse without SHA ref

Fix PHP notice

Github: rewording application help text strings ...

Make it clearer what the Github Application Client ID and Secret are
used for.

Github: add spacer rows around Application setup

Remove obsolete strings from Russian language files

Add and update Russian translate

Spanish translation

Catalan translation

Github: bump version number and minimum requirement ...

We now require MantisBT 1.2.16

Github: improve error handling ...

Print a more detailed error message when failing to retrieve a valid
JSON payload from Github.

This will hopefully facilitate troubleshooting of issues such as #56 in
the future.

Revert "Github: Wrong comparison of repository name" ...

This reverts commit a419068 which
introduced a regression issue causing the plugin to fail retrieving the
data from the post_receive hook.

This is due to using the wrong repository attribute to compare with the
repository name in the payload ('name' instead of 'info/hub_reponame').

Fixes #55

Github: Fix PHP system notices ...

- Undefined index: hub_app_access_token in api_uri()
  ==> added isset() check
- Undefined property: stdClass::$id in json_commit_changeset()
  ==> use 'sha' instead of 'id'

Bumping version numbers ...

Core framework version -> 0.18
Github -> 0.17
Gitweb -> 0.17
WebSVN -> 0.17

Github: update language strings following fix for #34

Github: Wrong comparison of repository name ...

On Github the repository names are not required to be lowercase. The
repository name send in the payload-data by Github could be something
like 'RePo-SiTory_NamE'.

In that case the comparison will fail and no import is possible.

Fixes #34

Signed-off-by: Damien Regad <damien.regad@merckgroup.com>

GitHub: Fix MySQL error 1292 when inserting date ...

When MySQL sql_mode is set to strict (STRICT_TRANS_TABLES or
STRICT_ALL_TABLES), the DB rejects the date insertions in ISO-8601
format (yyyy-mm-ddThh:ii-ssZ) as sent by GitHub with error "Incorrect
datetime value".

This commit converts the date to ISO-9075 format as accepted per MySQL
documentation [1]

[1] http://dev.mysql.com/doc/en/date-and-time-functions.html#function_get-format

Fixes #39

Added rudimentary dynamic rate limiting to SourceGithub to prevent it from going over the GitHub API rate limit. Issue #206

Added missing url_post() method from the last commit (oops\!), plus polished the user feedback in SourceGithub's OAuth page. Issue #206

Initial, but feature-complete OAuth2 support ontop of Github API v3. Issue #206

Ported to GitHub API v3 calls as v2 is now deprecated.

Updated contact url

Updated contact email

Update copyrights

Fix map() -> array_map()

Merge pull request #4 from cocox/master ...

Added option to get all branches with * branch name.

ref_name is no more used. Now it's ref with the whole ref : refs/head/master.

Added option to get all branches with * branch name for GitHub also.