Remove the panGesture's requirement that the tapGesture fails.

This makes the pan gesture more responsive when closing the menu, where there was previously a distance threshold that must be crossed before the content view would respond to the panGesture.
Remove unnecessary brackets.
Merge branch 'DavidBarry-drag-close-lag-fix' into develop
Update CHANGELOG for future release.
Add option to bounce contentViewController when calling `-closeMenuBehindContentViewController:animated:completion:` as well as a property to prevent the menu from resizing.
Fix coding style & improve demo app.
Improve behavior when the content view should bounce but is hidden.
Merge branch 'DavidBarry-bounce-when-navigating' into develop
Update CHANGELOG, VERSION & podspec.
Bump v1.5.0