initial commit
commiting issues works now, but the label does not appear
fixed empty titles
added comment feature, fixed completion date
fixed priority label
added icons from Trac (hopefully this is permitted...)
moved connectorCore extension to the proper plugin.xml
added GitlabAction
added milestones and assinees
renamed plugins and renamed packages
moved to maven
renamed directories
added new .gitignore
moved get(TaskRepository) method into GitlabPluginCore, which is now a
GitlabConnection manager, will be changed later

* this fixes the issue, where the gitlab project has been updated (new
milestones etc) and the local repository configuration is not up to date
fixed maven setup
added license headers
added license header template
moved connections into a separate connection manager (singleton)
fixed task repository category
fixed repository URL .git suffix