Merge tag '0.1.6'

release 0.1.6
add piwik data to request

- add caffeine.context_processors.piwikdata
- add settings PIWIK_HOST and PIWIK_SITEID
add test for piwik context processor

- remove condition from piwikdata
- add TestPiwikdataContextProcessor
Merge branch 'feature/reintroduce-piwik' fixes #18
fix broken piwik site id for #18
Merge branch 'release/0.1.7' into live