Fixed NSDecimalNumber properties deserialization
Travis CI config and shared Xcode scheme to run tests
iOS 6 does not support @import syntax
iOS 6 does not support .firstObject NSArray property
Fixed nondeterministic testDatabaseCloseFlushesCache
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Merge pull request #72 from ondrejmirtes/fix-decimal-number

Fixed NSDecimalNumber properties deserialization
Merge pull request #74 from wzph/master

Add a bit more context for primary key exceptions.
Merge pull request #75 from ondrejmirtes/travis-ci

Travis CI configuration and iOS 6 compatibility fixes
Restore equivalence of .firstObject after changes in commit 7962a2
New block call style for notification batching, which is now thread-local (fix #73)
Prevent nested calls to notification batches in the same thread
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