Merge pull request #3 from ameiralzoubi/master

Take into account contentInset when setting the contentSize for the scrollView

Applies to situations where the container scroll view's contentSize is shorter than its bounds height.
In that situation, substract the contentInset to prevent the view from scrolling although it does not have to.
Update to modern @import syntax
Documentation
Replace file header comments
Add missing [super awakeFromNib]