Add curlybracket theme and support for Sublime Text 3 on Linux

Adds my personal theme and also an alias for sublime text 3 to be accessed the same as sublime text 2 for convenience (st is shorter than subl3). Theme displays git, hg and svn status. Screenshot uses Source Code Pro and base16 colour theme.

![screenshot](http://i.imgur.com/akxYSrU.png)