fix a few bugs with the scss compiler

fix where the ruby scss compiler would crash node on syntax errors
change the scss compiler to always ignore files that start with an _
commit all the changes to srv-rubyscss
Merge pull request #1687 from iamkrillin/master

SCSS problems
Merge branch 'master' of https://github.com/madskristensen/WebEssentials2013

Conflicts:
	EditorExtensions/Resources/server/services/srv-rubyscss.js
Fix - If the file doesn't exists it tries 500 times then ultimately fails with a file not found exception.