Bump for 0.8.0

 - ST3 support @timonwong
 - Settings available from Preferences menu @timonwong
 - Racket/Scheme support @tlehman
 - Python indentation/empty line bugfix @antigluk
 - Perl support @amacleay
 - Node path bugfix @jcartledge
 - Doc update @jcartledge