Wimsapi

* Fixed `WimsAPI.putexo()`.
* Updated tests and unskipped some according to latest WIMS version.

* Fixed buggy import in setup.py

* Adding **Classe** higher level API, allowing to manipulate a WIMS' Class.
* Adding **User** higher level API, allowing to manipulate a WIMS' User.
* Adding documentation.

* More tests.

* Fixed travis CI.

* Add User and Class higher level classes.
* Add some tests fomr WimsApi.
* Add Travis CI.