iOS 6 fix to hide next previous accessory toolbar buttons when previous or next textfield pointers aren't set
Merge pull request #101 from setdirection/issue/ios6-hiding-next-previous-toolbar-buttons-when-there-are-no-pointers-to-next-previous-text-field

iOS 6 fix to hide next previous accessory toolbar buttons when previous ...
Fixed issue with SDDataMap mapping impossible data conversions.  See https://github.com/setdirection/ios-shared/issues/102.
Merge branch 'master' of github.com:setdirection/ios-shared
wrote a test for github issue #73.  there wasn't actually a problem, but the test verifies the behavior.
Rewrote how mock service responses are done.  Test implementation thus far.
Added "NSBundleForTestCase" to return the bundle for the current test case.
Documented new mocks functionality and wrapped it all in an #ifdef DEBUG to prevent it from being shipped.
Added a method to insert several mock files into the stack at once.
Added waitForAsynchronousTask and completeAsynchronousTask to NSObject+SDExtensions.