Use node-sass.

The `sass` npm does not properly compile all scss. 
It also looks less popular
Pass the cli arguments into precompiler render fns
Add cli arg for including paths in less/sass generation
Fix error reporting

In the case of an exception thrown that does not have a message or 
stack, undefineds were printed. Not so useful.
Change include to loadPath
load-path rather than loadPath
Add tests for load-path
Add test-tmp to .gitignore
Remove log line
Change test/kss-node's temp directory to test/output.
Add semi-colons to ends of lines.
argv.loadPath should always be an array.
Add Node.js 0.10 requirement.
Merge pull request #87 from kss-node/node-sass

Fix Sass compilation by switching to node-sass