Initial commit
Initialise a Phabricator library. This adds the src directory where the library code will be written. The .arcconfig file simply defines a dependency on Phabric
ator.
Make a start on the PHP extension of the PhutilEventListener class.
Get the path to the tornado phabricator library and the type of server that should be launched. Then call the tornado library passing to it the path and server followed by the diff id.