Add files.
Some work.
Refactoring.
Move Commit into it module.
Update author.
Small fixes.
CommitesWidget is added.
Commit: abbreviated_id is added.
CommitesModel: add ToolTip.
Not worked.
Fix last commit.
CommitesWidget; current_commit_changed signal is added.
Diff widget is added.
Commit: add lines_count to diff.
DiffWidget: add DiffHighlighter.
Commit: use git show for diff.
diffDock now in bottom dock area.
DiffWidget: panel is added.
Commit: changed_files is added.
DiffWidget: add files list.