Git: merged and delete_branch are added.
DeleteBranchDialog is added.
BranchesWidget: delete branch is added.
DeleteBranchDialog: small fix.
BranchesWidget: update list when delete branch.
DeleteBranchDialog: fix merge checking.
StatusWidget: Remove selected is added.
Commit: timestamp now return unix datetime.
CommitesModel: fix datetime format.
Styling.
Merge branch 'develop'
Merge branch 'master' of github.com:panter-dsd/PyGitGui