Fix sphinxpath

Fixes  #143 

With this PR the URL will remain as

http://api3.geo.admin.ch 

when one wants to access the doc. (and not http://api3.geo.admin.ch/main/wsgi/static/doc/build/ at the moment)

When using pserve the home page is now functional as well.

I also added a checker for the home page as well as an example.