Allow for arbitrary restrictions enforced by the app; fix for iOS4#4

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Clafou wants to merge 2 commits intoreddavis:masterfrom

Commits on Mar 30, 2013

Dragging now works as expected when the left and right values are constrained arbitrarily by the app. As demonstrated by adding restrictions to the sample app.
Clafou
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Commits on Apr 2, 2013

Fixes crash pre-iOS5
Clafou
committed