Un-rackified the gem.
Added Rails dependency for mattr_accessible.
Added Apiture.sign and Apiture.validate methods.
Added guard gem.
Added rb-fsevent and updated .gitignore
Added signature date to the headers and included it in the signing and validating .
Minor changes for guard.
Merge pull request #1 from octanner/unrack

Reverted gem from rack back to a rails-based architecture