ArtistRels
Using setProperty
Added 'force' flag to skip cache
Add ability to get primary and secondary type for release group
Added missing 'force' parameter in mb.lookup. Added mission 'discids'
entry in loaded entities
Added support for primatyType and secondaryTypes to release groups.
Changed proprty names from primary-type to primaryType and
secondary-type-list to secondaryTypes. Made sure secondaryTypes is
always an array.
Fixed lifeSpan properties for artist and label
Fixed typo
Entity.data() now returns only data even of Entity type properties
How to contribute
Added timetrickle dependency
Fixed trickle module name
Fixed dependency versions
Bump version number
Merge branch 'master' of github.com:maxkueng/node-musicbrainz

Conflicts:
	package.json