Updated tracking code, new features, minor bug fixes

Version number: 1.2.0
Stability: Stable
Compatibility: 1.5, 1.6, 1.6.1, 1.6.2.0, 1.7, 1.8, 1.8.1
Change Log:
Updated javascript tracking code.
Added tracking products purchased.
Added ignore subdomain config.
Split ajax checkout to footer with fix for one-page checkout.
Fixed newsletter subscribe.
Added error checking to prevent faults.