After setting utility buttons, call layoutIfNeeded on button view

This fixes button width not being set correctly in some cases on iOS 8.
Fixes #237
Merge pull request #238 from confide/master

Fixes #237, Right utility buttons don't work properly on iOS 8
Updating podspec version to 0.3.4
Update README.md
Updated sample project for new screens also fixed #244
Merge branch 'master' of github.com:CEWendel/SWTableViewCell
Updating podspec to 0.3.5
Adding CGFloat rounding to avoid layout issues. Fixes #253
Updating podspec to 0.3.6
These are not necessary and impose a huge performance hit during scrolling
Merge pull request #257 from Hitta/performance

These are not necessary and impose a huge performance hit during scrolling
Reverting 047cd75
Merge remote-tracking branch 'upstream/master'