Re-enable transaction rollback
Allow calling -cancelWriteTransaction from within a transaction block
Fix crash in RLMSuperSet

Setters return void, not id.
Merge pull request #1040 from realm/tg-rlmsuperset

Fix crash in RLMSuperSet
fix rubymotion example
Merge pull request #1041 from realm/jp-RubyMotion-sample-framework-load-fix

[RubyMotion] Specify the Realm framework as a framework instead.
Merge pull request #1032 from realm/tg-rollback

Re-enable transaction rollback
Speed up creating RLMRealm instances on background threads

Cuts the time taken to create RLMRealm instances when there's already an
instance on another thread by over 80% (25ms to 4.5ms on my iPod touch with the
extremely large test schema).