update to current HockeySDK

 Submodule changes to be committed:

 * Vendor/HockeySDK 23ec4f9...fd70d1e (69):
   > Workaround for having multiple uuid parameters in our update requests when BITAuthenticator provides an anonymous uuid
   > Fix for not updating the installationIdentification property when it changes
   > Update BITAuthenticator documentation
   > Update changelog to make it clear that BITStoreUpdateManager is optional and disabled by default
   > Improve BITStoreUpdateManager documentation
   > We shouldn't forget to reset the didEnterBackgroundState flag
   > Only check for new feedback when the app becomes active and was actually in the background previously
   > only reset validation flag once we actually went to the background
   > Only check for updates when the app becomes active and was actually in the background previously
   > allow to specify a custom URL scheme
   > update needsValidation
   > redo BITAuthenticator interface
   > Merge pull request #62 from Newstex/pull-requests/environment-typo
   > Add lcov 1.10 which is required to generate code coverage
   > Fixes for getting test coverage working again
   > Fix failing test due to the test was expecting a different default setting, which was changed recently
   > return an NSString instance instead of NSUUID
   > add initial tests for BITKeychainUtils
   > set ONLY_ACTIVE_ARCH to yes for unit tests
   > fix typo
   > Update bit_appAnonID helper to make sure to get a UUID for an app installation and works through the app installation lifetime on the device
   > Provide an iOS 5 compatible C helper for getting a UUID
   > Clean up appIdentifier and keychain servicename to be defined only once
   > Update OCMockito and OCHamrest frameworks to version 3.0 including 64bit slices
   > Add ARM-64 as code type for crash reports
   > Merge pull request #61 from Newstex/pull-requests/auth-skip-cleanup
   > show proper error when UDID it not allowed to access
   > use keychain attribute thisDeviceOnly instead of custom validation
   > fix typo
   > fix passed in udid not validated
   > fix build of tests
   > cleanup
   > Fix for userName, userEmail, and userID in crash reports.
   > deprecate unused delegate method
   > cleanup public (private) interface
   > allow developer to provide a custom parentViewController
   > Documentation improvements for BITAuthenticator
   > fix typo
   > Instead of returning a nil view in the last commit, return an empty view controller
   > Make sure update checks are never don from the AppStore environment also if the Update UI wasn't removed from the release build
   > Merge pull request #59 from mlilback/develop
   > Change BITStoreUpdateManager default check interval to weekly
   > Some more documentation improvements
   > Update to version 3.5.0 Beta 3
   > Add How to for Authenticating iOS Users with BITAuthenticator
   > Workaround for iOS 7 bug with multiple modal view controllers in landscape on iPad
   > bit_appAnonID already checks for the identifierForVendor.
   > Don't use identifierForVendor on iOS 5.
   > Update to version 3.5.0 Beta 2
   > Add CPU_SUBTYPE_ARM_ALL to identify arm64, just in case
   > More documentation improvements
   > Add support for background fetch in BITUpdateManager
   > Add support for background fetch in BITStoreUpdateManager
   > Add support for background fetch in BITFeedbackManager
   > Add support for background fetch in BITCrashManager
   > Documentation improvements
   > Merge pull request #56 from florianbuerger/develop
   > fix authentication dialog presented when application wakes up in background
   > fix duplicate count of installation
   > cleanup, remove additional early return
   > Fix a crash with the update view running on iOS 5 and 6
   > Fix BITUpdateManagerViewController not showing any versions
   > Fix documentation formatting of sample code
   > Make sure the simulator build also contains x86-64 slice
   > Include a PLCrashReporter build that includes a x86-64 slice
   > Merge pull request #55 from ksuther/develop
   > Documentation updates and fixes
   > delay start of authentication manager
   > Small changelog fix and added missing item
update xcodeproject