Described readme with new DSL
Small re-factor
Added searchable DSL 'associate'
Change callback initialization
Added automatic sunspot_associate to association
Updated README
Added license
Merge branch 'refs/heads/master' into features/searchable-dsl

Conflicts:
	lib/sunspot_association.rb
Merge pull request #1 from Arjeno/features/searchable-dsl

Searchable DSL