Keychain and touchID AccessControl attributes

As part of AGIOS-103, KeychainWrap should be able to work with kSecAttrAccessibleWhenPasscodeSetThisDeviceOnly access controle to allow touchID activation.

See session 711 of WWDC for more details.
Written transcript here:
http://asciiwwdc.com/2014/sessions/711
Sample in obj-c here:
https://developer.apple.com/library/prerelease/ios/samplecode/KeychainTouchID/Listings/KeychainTouchID_AAPLKeychainTestsViewController_m.html