removed director and resourful from dependencies

removed duplicate entries
director and resourceful are already included in peer dependencies

this caused an error when using restful as standalone server with relational resources. because restful used a diffent resourceful than the calling application the routes for the children resources could not be created

the stacktrace of the error:
<pre>
C:\myproject\node_modules\restful\lib\restful.js:228
    var entity = resource.lowerResource,
                         ^
TypeError: Cannot read property 'lowerResource' of undefined
    at C:\myproject\node_modules\restful\lib\restful.js:228:26

    at Array.forEach (native)
    at _extend (C:\myproject\node_modules\restful\lib\restful.js:227:13)
    at C:\myproject\node_modules\restful\lib\restful.js:322:13

    at Array.forEach (native)
    at null.<anonymous> (C:\myproject\node_modules\restful\lib\restful.js:313:30)
    at Router.path (C:\myproject\node_modules\director\lib\director\router.js:305:12)
    at null.<anonymous> (C:\myproject\node_modules\restful\lib\restful.js:298:12)
    at Router.path (C:\myproject\node_modules\director\lib\director\router.js:305:12)
    at C:\myproject\node_modules\restful\lib\restful.js:242:12
</pre>