Allows installation of packs with no optional mods without having to
show the Mods Selection screen
Add in GitHub icon
Forgot to commit the Icon
fixing redownloading of valid files
Merge remote-tracking branch 'upstream/master'

Conflicts:
	src/com/atlauncher/gui/BottomBar.java
	src/com/atlauncher/gui/ConsoleBottomBar.java
	src/com/atlauncher/workers/InstanceInstaller.java