Create library fixes

@dchambers one for you to review..

- create-library command now supports a '-t' flag so it can create both br and thirdparty libs
- removed the 'thirdparty-libraries' dir from within apps, all libs now live in the 'libs' directory
- remove the 'thirdparty' and 'br-libs' from SDK, all SDK libs now live in sdk/libs/javascript