* Now crediting the right referrer for any goal conversion 
 * Referrer URLs, timestamp, and Campaign name & keyword (parsed from the landing page URL) are now stored in a first party cookie (JSON encoded)
 * Added getters to the piwik.js to allow passing the values from the client, to store for later use in the PHP/Java Tracking API (paypal use case)
 * Added integration tests and basic JS tests 

Refs #2172
 * Added a new API function: setAttributionInfo( $jsonEncoded ) which accepts JSON encoded array of 4 values (see implementation for details what to do with these values)
 * 2 new parameters are: _rcn and _rck to pass to piwik the campaign name and campaign keyword that will be creditted for the Goal conversion (if a goal is converted)
 * Also renamed setUrlReferer to setUrlReferrer -- Important that all public facing APIs use the proper writing

Refs #2222 Accurate Paypal tracking (or any other third party "after the fact" Goal conversion): implementation is now done, we must write some kind of guide and test 

git-svn-id: http://dev.piwik.org/svn/trunk@4378 59fd770c-687e-43c8-a1e3-f5a4ff64c105