Update Unity gitignore
Add ignore for web workbench add-on (sass files).
Merge pull request #932 from fredgate/master

Updated rules of 'VisualStudio.gitignore' about Web workbench add-on.
Merge branch 'master' of https://github.com/github/gitignore
Update nanoc.gitignore

new site Nanoc
Merge pull request #933 from diegoleme/master

Update URL in nanoc.gitignore
Merge pull request #924 from CaseyB/master

Update Unity gitignore to not commit user preferences