gem: updated dependency
Migrated to use newest Guard API
Improved code legibility

Snippets took from guard-sass code
Make uglifier read options passed to it.

Add .min.js suffix to minified files
Update Guardfile template
version: updated

Updated to new major version because previous Guardfile will not work
with this new one, also the generated files changed name.
Merge pull request #1 from erick2red/pull-container

Update to latest Guard