v0.97.1

API breaking changes

• None.

Enhancements

• Swift: Added Error enum allowing to catch errors e.g. thrown on initializing
  RLMRealm/Realm instances.
• Fail with RLMErrorFileNotFound instead of the more generic RLMErrorFileAccess,
  if no file was found when a realm was opened as read-only or if the directory part
  of the specified path was not found when a copy should be written.
• Greatly improve performance when deleting objects with one or more indexed
  properties.
• Indexing BOOL/Bool and NSDate properties are now supported.
• Swift: Add support for indexing optional properties.

Bugfixes

• Fix incorrect results or crashes when using -[RLMResults setValue:forKey:]
  on an RLMResults which was filtered on the key being set.
• Fix crashes when an RLMRealm is deallocated from the wrong thread.
• Fix incorrect results from aggregate methods on Results/RLMResults after
  objects which were previously in the results are deleted.
• Fix a crash when adding a new property to an existing class with over a
  million objects in the Realm.
• Fix errors when opening encrypted Realm files created with writeCopyToPath.
• Fix crashes or incorrect results for queries that use relationship equality
  in cases where the RLMResults is kept alive and instances of the target class
  of the relationship are deleted.