Mw-api-client

Changes:


* Update excs doc to use new method
* Rework current user system
+ Add CurrentUser class that represents the logged in user. It has a `user` attribute that refers to a User object that also represents the current user.
* Potentially breaking: emailuser and clearhasmsg methods of User are now in CurrentUser

Changes:
- Hide KeyError raised and only show notfound
- Fix path in setup.py

Reworked exceptions and warnings system.