Add FogBugz and Kiln integration web hooks to Hammock

* FogBugz open case notification via URL Triggers
* Kiln commit notication via custom web hook
Change reference from $_POST to $req['post'] in kiln hook plugin

Good catch - this was leftover from a port from a previous tool.
Merge pull request #3 from there4/fogcreek_plugins

Add plugins for FogBugz and Kiln web hooks to Hammock