Set correct release date.
Merge branch 'master' into capakey_gateway
Add testconfig to tox.

For some reason tox doesn't like suds. Integration tests are disabled
using tox.
Update code coverage.
Adding a capakey gateway.

The capakey gateway present a more opionated view of the capakey
service.
Added an example of using the capakey gateway in stead of the client.
Expand readme file with capakey gateway info.
Add utility properties to objects.

Add properties `afdelingen` to Gemeente, `secties` to Afdeling and
`percelen` to Perceel.
Fix parsing of boolean values.
Added some docs.
Expanded docs.
Added exception wrappers.
Added __repr__ to the capakey gateway module classes
Unit testing for __repr__.