Git: create_tag is added.
AddTagDialog is added.
CommitesWidget: add AddTag action.
Merge branch 'feature/AddTagDialog' into develop
DiffHighlighter: small codefix.
Styling.
Codefix.
Git::create_tag: message unneeded by default.
CommitWidget: fix bug.
Merge branch 'master' into develop
Git: repo_path is added. commit_message is added.
Set Git.repo_path on start.
CommitWidget: load commit message.
CommitWidget: allow commit with empty message, but not empty description.
Merge branch 'develop'