Implement Upgrader::abort

Add forgotten abort() method of the Upgrader trampoline class, and allow
getErrors() not to crash if not upgrading
Merge pull request #619 from greezybacon/issue/upgrader-abort

Implement Upgrader::abort
Reviewed-By: Peter Rotich <peter@osticket.com>
Support disabling a page
Merge pull request #620 from greezybacon/issue/page-deactivate

Support disabling a page
Reviewed-By: Peter Rotich <peter@osticket.com>
Drop "forced" database ENGINE on table - sysadmin know best!
Merge pull request #621 from protich/issue/db-engine

Database Storage Engine

Reviewed-By: Jared Hancock <jared@osticket.com>