Add SpeakerAssociation model

Addition based on patch speaker-association.diff provided by juyrjola
Add option "--dry-run" to eduskunta importer

Option will (pretty)print MP details, but does not commit the changes to the database
Include speakers committee in MP membership parsing
Add SpeakerAssociation saving
Add new speaker association migration 0019
Merge remote-tracking branch 'joona/issue-73'
Fix speaker importing

Closes #73.
Activate Bootstrap tooltips

Class `js-tooltip` needs to be added to the DOM node. Dynamically created
nodes need manual activation.
An indentation fix

Seemed to work by luck
Fixed internationalization of a message

Fixes #41
Hacked django makemessages not to screw an i18n

Fixes #41 again