wait for the app to actually listen before calling address()
Replaced fs.readFile with require for JSON files

As  of node v0.5.x we can require a .json file
the same way we do it for .js files.
http://nodejs.org/api/modules.html#modules_file_modules
Merge pull request #72 from jaipandya/patch-1

Replaced `fs.readFile` with `require` for json config files
Merge pull request #44 from lornajane/listen

wait for the app to actually listen before calling address()
Merge remote-tracking branch 'mashery/master'