APY-77 : Documentation stuff

Small updates and fixes.
APY-80 : Update plugins to the new plugin API
APY-80 : Update plugins to the new plugin API
APY-80 : Update plugins to the new plugin API
APY-54 : Error notifications refactoring

Started thw error translator wrapping.
APY-54 : Error notifications refactoring

Finished error wrapping on a service level.
APY-94 : Update liveblog plugins to the new plugin API
Merge pull request #5 from sourcefabric/apy-8-implement-x-filter

Apy 8 implement x filter
Merge branch 'packaging_ally' into apy-8-implement-x-filter