fixed issue with show at revision button. Some JS were not properly loaded due to ajaxified files view.
Removed JS code and the logic for that is in python view now. Simpler and less ugly JS callbacks

smarter calculation of showed associated changeset in file source view
- before rhodecode showed TIP changeset when initially displaing file source as description of associated commit
this can be misleading. Now smart calculate last commit of a file, and show specific commits when switching from history view

Calculate file history always from latest changeset to always show full history.
When doing the calculation from a particular changeset git doesn't any records from parent changesets

Don't allow cherry picking changesets from the changelog using checkboxes.
Change pull request text that will indicate opening pull request against checkec changesets

fixes #591 git backend was causing encoding errors when handling binary files
- added a test case for VCS lib tests

Fixed #585, checks for status of revision where to strict, and made opening pull request with those revision impossible due to previosly set status.
Checks now are made also for the repository.

#590 Add GET flag that controls the way the diff are generated, for pull requests we want to use non-bundle based diffs,
That are far better for doing code reviews. The /compare url still uses bundle compare for full comparision including the incoming changesets.
- Fixed tests

Add git version detection to warn users that Git used in system is to old. ref #588
- also show git version in system details in settings page

Make detecting bare Git repositories more robust

Git remote repositories may end on '.git', e.g. myrepo.git. Just checking
for a repository path to end on '.git' causes 'Repository not found' errors
in such a case. To distinguish between bare and normal Git repositories,
check if there is a '/.git' part at the end of the repository path
(i.e. if GIT_DIR is pointing to '.' (bare) or '.git').

#518 multiple issues patterns
- added logging
- some code cleanup
- added example of wiki pattern to .ini file
- updated contributors and changelog

Allowing multiple issue servers to be autolinked in the changeset view;
linking is now contingent on issue_server_link, issue_pat and issue_prefix
being defined; multiple servers can be used by specifying a common suffix on all
the above variables, ie ..

issue_server_link_1
issue_pat_1
issue_prefix_1

.. and ..

issue_server_link_other
issue_pat_other
issue_prefix_other

.. would be treated as two distinct servers, but ..

issue_pat_thing

.. would be ignored (since the other two requisite vars aren't present).

This patch is backwards compatible with existing variables (as a suffix
isn't needed).

fixed #570 explicit users group permissions can overwrite owner permissions
- added test for that case

swap the select values with revisions dynamically when switching the repos on pull request view
- fix the partial ajax request that should never do redirect

fixes #567 diff non-unicode encoding missmatch
- now uses safe_unicode ass all other parts of the system

fixes issues #566 non-ascii search params are crashing paginator
- those arguments needs to be converted to strings

Implemented patch from andrewsh ref #565 Add support for {netloc} and {scheme}
to alternative_gravatar_url

Implemented permissions for writing to repo
groups. Now only write access to group allows to create a repostiory
within that group