Merge pull request #2 from ProxiBlue/master

Add code to send email invoice via email.
Prepare for Composer.

Signed-off-by: Ben Corlett <bencorlett@me.com>
Merge pull request #3 from bencorlett/master

Added Composer Support
Fix store scoping of System Configuration data

Updates all references to Mage::getStoreConfig() to use
$this->getConfigData(), which ensures that the data is scoped to the
store that the order came from.
Improve refunding with eWay Direct

 - Add support for partial refunds
 - Add sandbox gateway URL for refunds
Chnage how the invoice email is sent to an observer event