wrap OC_Hook into api class
Merge branch 'master' of github.com:owncloud/appframework into hook_api

Conflicts:
	core/api.php
return in api::isAppEnabled
Merge pull request #6 from houqp/fix

return bool result in api::isAppEnabled
added registeradmin and backgroundjob tasks to api
use public hook methods in api class
Merge branch 'master' of github.com:owncloud/appframework into hook_api

Conflicts:
	core/api.php
filter false signalClass in clearHook method
Merge pull request #5 from houqp/hook_api

wrap OC_Hook into api class