Merge pull request SublimeText#135 from SublimeText/dev

Dev

Merge pull request SublimeText#75 from vors/lightshow

Make tmLanguage file work with lightshow

Merge pull request SublimeText#37 from vors/master

Add Contributing section

Merge pull request SublimeText#12 from JPRuskin/patch-1

Update Support/Powershell.sublime-build