Python-thingsdb

* Compliant with Type methods, issue 13.

* Fixed bug in Emitter class which did not accept an empty emitter string, issue 12.

* Fixed bug in Emitter class which could modify event data, issue 11.
* Added support for the Enum type to be defined by more than one collection, issue 10.

* Fixed bug when watching multiple collections, issue 9.

* Added Emitter class, issue 8.

* Improved enumerator support, issue 7.