All versions of Client for GitHub

Theme color changed Use Material Design icons in the toolbar. Add support for notifications. Improve user and repository search. Improve how GitHub links are opened. New UI for the search bar. Load issue templates for new issues when available. Show starred repositories in the home and user activities. Add a new event to issues when someone comments the code. Improve the source viewer for many languages. Show who changed the assignee of an issue. Some minor UI fixes and improvements.