Improve compatiblity of RemoteTK with ForceTK

Changes to allow RemoteTK to be used as a drop-in replacement for ForceTK:
Add setSessionToken, setRefreshToken, and setUserAgentString noop functions.

Return referenceTo attribute with describe responses.

Return totalSize and done attributes with query responses.
Merge pull request #25 from cwarden/remotetk-forcetk-compatibility

Improve compatiblity of RemoteTK with ForceTK