Attempt to coordinate for both reading and writing.

[FIXED]     Try to fix "bad file descriptor" error when reading StoreUUID.
Fixed a bug which caused StoreUUID to be unavailable on new installs.

[FIXED]     Removed the forced write coordination over the whole cloud store loading.
                - Initially intended to demark a sort of "transaction" for writing StoreUUID so as to force a conflict if another device committed a StoreUUID after we started tryLoadCloudStore but before we finished it.
                - Is causing trouble with coordinating read access to StoreUUID, looks like the coordinators are not actually coordinating read access anymore thus we don't block until StoreUUID becomes available locally for reading.
Merge branch 'master' of git://github.com/lhunath/UbiquityStoreManager into HEAD

Conflicts:
	UbiquityStoreManager/UbiquityStoreManager.m
Added detection code for a possible loop.

[FIXED]     An infinite loop might occur if the application does a cloudEnabled without checking cloudAvailable when the ubiquity token is unavailable.
Fixed a cloudEnabled/cloudWasEnabled cyclic dependency.
Fix some broken interactions between cloudWasEnabled and cloudEnabled.

[FIXED]     cloudWasEnabled was updated too early.
[FIXED]     loadLocalStore set cloudWasEnabled to YES instead of NO.
Provide the ubiquity changes to the application.

[UPDATED]   Passing the ubiquity changes to the application before importing them so the application can do something custom with them if it needs to.
Make disappeared method deprecated.

[UPDATED]   -managedObjectContextForUbiquityChangesInManager: is now deprecated in favor of -ubiquityStoreManager:managedObjectContextForUbiquityChanges:
Added storeConfiguration to constructor.

[ADDED]     Ability to specify the persistence configuration with which to load the store.
[ADDED]     A default constructor that assumes nil for all optional parameters.
Merge commit '9ef87ba'
Forgot to specify type of storeConfiguration.

[FIXED]     Missing type on storeConfiguration.
Merge pull request #2 from lhunath/master

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