App update

* Update .gitignore, remove a bunch of generated files from the repo.
* Include dedicated setup screen.
* Remember match configuration (player name, prompt with previously-entered opponent names).
* Allow reset of match in progress.
* Update help page to use webview, added link to bl00dw0lf GitHub repo.
* New match screen layout.
* Update build tools and gradle plugin versions to play nice with Android Studio 0.6.1.