Added SassBuilder

Sass Builder is a config based Sass compiler for Sublime Text 2. Your raw sass/scss folder contains '.sassbuilder-config' file which gets processed upon save of any .sass or .scss file in that folder.
Update repositories.json

Added https://github.com/bnlucas/flask-snippets "Flask Microframework Snippets"
Updated name.
Removed st2-flask-resources
Merge pull request #1393 from bnlucas/master

Added Sass Builder.