Fixes Value Stored Never Read warning

This commit fixes the following warning: `Value stored to
'saveCallbacks' is never read`
Fix Dereference of Null Pointer warning

This commit fixes the following warning: `Dereference of null pointer
(loaded from variable 'saveCallbacks’)`
Fix Implicit Conversion warning

This commit fixes the following warning: `Implicit conversion loses
integer precision: 'NSUInteger' (aka 'unsigned long') to 'int’`
Merge pull request #27 from sbonami/27-Fix-Xcode-warnings

Fix Xcode warnings
Break down Save Request method
Fix cascade deletion of related objects
Merge pull request #25 from sbonami/25-Fix-cascade-deletion-of-related-objects

Fix cascade deletion of related objects
Merge remote-tracking branch 'origin' into 28-Break-down-Save-Request-method

* origin:
  Fix cascade deletion of related objects

Conflicts:
	PFIncrementalStore/PFIncrementalStore.m
Merge pull request #28 from sbonami/28-Break-down-Save-Request-method

Break down Save Request method
Bump version to 0.0.3
Merge pull request #29 from sbonami/0.0.3-Bump-Version

Bump version to 0.0.3
Remove property/relationship object if no value

Allows unsetting/removal of properties and relationships (to-one) if it
is removed in-app and persists to Parse
Merge pull request #32 from Alydyn/master

Remove property/relationship object if no value
Update README.md

Add Bitdeli analytics badge
Extract NSManagedObject category

This commit extracts the NSManagedObject category so that the
pf_resourceIdentifier can be exposed along with the various key name
constants.

Conflicts:
	PFIncrementalStore.xcworkspace/contents.xcworkspacedata
Add logic to specify intended Parse Object

This commit add logic to specify the intended Parse Object with which
the IncrementalStore should sync.

Conflicts:
	PFIncrementalStore/PFIncrementalStore.m
Merge pull request #34 from sbonami/Add-ability-to-select-parse-class-name

Add ability to select parse class name
Add PFFile support

This commit adds PFFile syncing support so that an Object attribute may
be a Parse File. This synchronously fetch the File’s data and sets that
equal to the object’s attribute.
Add spec tests for PFFile support

This commit adds spec tests for the PFFile support.
Merge pull request #35 from sbonami/Add-PFFile-support

Add PFFile support