Modified generator to include SASS Boilerplate from BarkleyREI repo.

This closes #5.

The new SASS Boilerplate can be managed at BarkleyREI/sass_boilerplate

Also:

- Removed prompt for app version
- Removed grunt-rev. This fixes #4.
- Modified CSS sprite settings to not be included if SASS is selected.
- Corrections to Gruntfile.js for SASS inclusion (watch directory was wrong)

Updated package.json with contributors and new version number (upgraded to v0.5.0)