Credited Galen O'Hanlon in README.
Correctly attributed Vincent Charles.
Allow resource type (file extension), to be customized.

Signed-off-by: Chris Lloyd <christopher.lloyd@gmail.com>
Gravtastic now only includes the other methods when `is_gravtastic` is called.

Also, the API has changed. Gravtastic::Resource was stupid, it's just Gravtastic now.
Merge branch 'master' of git@github.com:chrislloyd/gravtastic

Conflicts:
	lib/gravtastic.rb
Bang bang, I shot Ditz down.
New version, working swell.
Some change I made ages ago, I can't remember why. If it's wrong, tell me.
Specs!

Disabled Datamapper integration specs because the gem is kinda funny ATM. I've seen it pass before and it works with Ruby, so no biggie.
New version, new README.
Whoops.
Tidied up README.
Fix description column in README.
Syntax fix in readme.
More cleaning to the README.
README and loading refinements.
README grammar change.
Refactored things slightly. Also reinstated `rake spec`.
Bump version, 2.1.1.
Fixed bug.