Fixed issue where 'centerInView:' wasn't always using the correct superview
Merge pull request #24 from liamnichols/master

Fixed issue where 'centerInView:' wasn't always using the correct superview
Update README.md
updated demo project settings
cleaned up and documented demo project
added '-pinAttribute:toAttribute:ofItem:withConstant:relation:' method to match the soon to be deprecated pinEdge alternative
added seperate deprecated methods header file and updated deprecated tags to indicate what method to use instead
deprecated old methods that have been re-written better. deprecated warning instructs what method to use instead
added overview to depreacted header
Fully documented deprecated header
began to document the main header
moved deprecated methods back into main header (seperate interface). Removed usages of methods from demo vc, changed JRTViewPinEdges to NSUInteger so i can be included in appledoc (check that this is ok)
moved deprecated methods back into main header (seperate interface). Removed usages of methods from demo vc, changed JRTViewPinEdges to NSUInteger so i can be included in appledoc (check that this is ok)
added documentation for constrianing to size methods
fully documented header
fixed spelling mistakes
refactored methods into the same order as documented in the header. Documented private methods in private interface.
updated warning about deprecated methods
updated readme with installation instructions and important information about deprecated methods
Additional method to handle uneven view widths when spaced evenly in a container view