Category for inserting child view controller
###No more dispute what method commes before which, when adding / removing child UIViewController...
##Usage
For inserting
[self containerAddChildViewController:self.childViewController];
Or if you want to add the child view controller to a specific view inside the parent
[self containerAddChildViewController:self.childViewController toContainerView:self.containerView];
Fitting with autolayout
[self containerAddChildViewController:self.childViewController toContainerView:self.containerView useAutolayout:YES];
For removing
[self containerRemoveChildViewController:self.childViewController];
##Note The child view is fitted to the parent view, and when useAutolayout is YES, constraints are added, which ensure the correct resize behaviour
##License Apache License 2.0: http://www.apache.org/licenses/LICENSE-2.0.txt
##Credits min:60 - Building perfect mobile apps, worldwide - https://min60.com