0.7.0

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Closed issues:

• Always getting "Error trying to access to non available kSecUseOperationPrompt in iOS7" log #24
• Default accessiblity should be kSecAttrAccessibleWhenUnlockedThisDeviceOnly #17

Merged pull requests:

• Update default accessibility #26 (tupakapoor)
• Only show ios7 error message when attempting to use access control #25 (tupakapoor)