added support for dylib dependencies which are pretty common on iOS / OS...

added support for dylib dependencies which are pretty common on iOS / OS X (i.e. sqlite3.0.dylib, zlib.dylib,etc) from /usr/lib folder. I personally use quite them quite frequently when creating extensions. Makes it simple to push to Xcode project vs having to create a custom .xcodeproj just to add some dylibs. Is there another way to do this?