v0.1.4

Released to RubyGems on 2015-06-09.

• Fixed non-polymorphic associations recalculating the counter twice (as old and new association) on every save; the old association is now only recalculated when the foreign key changed (#7, thanks @cainlevy).
• Restored the gemspec's rails dependency to >= 3.1.

Full changelog: v0.1.3...v0.1.4