*Extend*

TODO:

 * General overview: Use APIv3 and hooks. Package code in Civi extensions or CMS extensions (w/trade-offs).
 * Assimilate: http://wiki.civicrm.org/confluence/display/CRMDOC/Create+an+Extension
 * Assimilate: http://wiki.civicrm.org/confluence/display/CRMDOC/Publish+an+Extension