Added branch and tag support to the git repository viewer. (#1406)

Many thanks to Adam Soltys and everyone else who tested this patch.

* Updated git test repository so it has a branch with some differences from the master branch
* Moved redmine diff class into a module so as not to clash with diff-lcs gem which is required by grit
* Find changesets from all branches, not just master
* Got revision browsing working
* Got file actions working properly
* Allow browsing by short form of commit identifier
* Added a method to retrieve repository branches
* Allow browsing by branch names as well as commit numbers
* Handle the case where a git repository has no master branch
* Expand revision box and handle finding revisions by first 8 characters
* Added branches dropdown to repository show page
* Combined repository browse and show into a single action.  Moved branch/revision navigation into a partial.
* Renamed partial navigation -> breadcrumbs
* Made it so latest revisions list uses branch and path context
* Preserve current path when changing branch or revision
* Perform slightly more graceful error handling in the case of invalid repository URLs
* Allow branch names to contain periods
* Allow dashes in branch names
* Sort branches by name
* Adding tags dropdown
* Need to disable both branches and tags dropdowns before submitting revision form
* Support underscores in revision (branch/tag) names
* Making file history sensitive to current branch/tag/revision, adding common navigation to changes page
* Updated translation files to include labels for 'branch', 'tag', and 'view all revisions'
* Reenable fields after submit so they don't look disabled and don't stay disabled on browser back button
* Instead of dashes just use empty string for default dropdown value
* Individual entry views now sport the upgraded revision navigation
* Don't display dropdowns with no entries
* Consider all revisions when doing initial load
* Fixed bug grabbing changesets.  Thanks to Bernhard Furtmueller for catching.
* Always check the entire log to find new revisions, rather than trying to go forward from the latest known one
* Added some cleverness to avoid selecting the whole changesets table any time someone views the repository root
* File copies and renames being detected properly
* Return gracefully if no revisions are found in the git log
* Applied patch from Babar Le Lapin to improve Windows compatibility

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@2840 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/functional/repositories_subversion_controller_test.rb

@@ -47,18 +47,18 @@ class RepositoriesSubversionControllerTest < Test::Unit::TestCase
     end
     
     def test_browse_root
-      get :browse, :id => 1
+      get :show, :id => 1
       assert_response :success
-      assert_template 'browse'
+      assert_template 'show'
       assert_not_nil assigns(:entries)
       entry = assigns(:entries).detect {|e| e.name == 'subversion_test'}
       assert_equal 'dir', entry.kind
     end
     
     def test_browse_directory
-      get :browse, :id => 1, :path => ['subversion_test']
+      get :show, :id => 1, :path => ['subversion_test']
       assert_response :success
-      assert_template 'browse'
+      assert_template 'show'
       assert_not_nil assigns(:entries)
       assert_equal ['folder', '.project', 'helloworld.c', 'textfile.txt'], assigns(:entries).collect(&:name)
       entry = assigns(:entries).detect {|e| e.name == 'helloworld.c'}
@@ -68,9 +68,9 @@ class RepositoriesSubversionControllerTest < Test::Unit::TestCase
     end
 
     def test_browse_at_given_revision
-      get :browse, :id => 1, :path => ['subversion_test'], :rev => 4
+      get :show, :id => 1, :path => ['subversion_test'], :rev => 4
       assert_response :success
-      assert_template 'browse'
+      assert_template 'show'
       assert_not_nil assigns(:entries)
       assert_equal ['folder', '.project', 'helloworld.c', 'helloworld.rb', 'textfile.txt'], assigns(:entries).collect(&:name)
     end
@@ -131,7 +131,7 @@ class RepositoriesSubversionControllerTest < Test::Unit::TestCase
     def test_directory_entry
       get :entry, :id => 1, :path => ['subversion_test', 'folder']
       assert_response :success
-      assert_template 'browse'
+      assert_template 'show'
       assert_not_nil assigns(:entry)
       assert_equal 'folder', assigns(:entry).name
     end