Resolves #139, crash on Autolayout code due to constraints

[MobileVet]

This resolves the crash on iOS 6 and has no impact on iOS 7+.

Ideally, we think it might be best to rethink the view hierarchy and NOT move the contentView out of the UITableViewCell root, but instead pull the subviews out and place those in the ScrollView. That would require substantial reworking though so we opted for this in the near term.

Hopefully this will help some other folks in the mean time.
Great library!
MV

[zygoat]

The problem with extracting the subviews is that it defeats run-time view setup in the subclass; that is to say, it makes it impossible to substitute SWTableViewCell for UITableViewCell in an existing implementation without re-writing the subclass to know about SWTVC's specific view hierarchy requirement.

SWTVC used to work that way before I implemented all the auto-layout stuff. Part of my goal was to address this problem so as to make SWTVC more properly a drop-in replacement for UITableViewCell.

(Of course, the error I made was in not testing properly on iOS 6, and then not anticipating the grossness of the workarounds required to cope with the layout bugs therein. Sigh…)

[MobileVet]

Good point about the extraction defeating the drop in nature...

Well, this change does resolve the crash.

[Pacha56]

With the fix my App stopped crashing in iOS >= 6.0 but swipeableTableViewCellShouldHideUtilityButtonsOnSwipe doesn't work now.

Any suggestions?

[bawn]

This problem has been bothering me for a long time