[CSS] Make setting both the right and left (or top and bottom) of a view work like real CSS. Add new properties for relative positioning that allow to specify a different relative view for each edge.
[CSS] Remove all references to -mobile-relative, margin-left, margin-right, margin-top, and margin-bottom.
[CSS] Fix crash in CSS demo app.
[CSS] Remove extra reference to margin-top.
[CSS] Add left-of, right-of, above, and below to documentation.
[CSS] Fix unused variable warning in NICSSRuleset.
[CSS] Make new relative positioning documentation clearer.
[CSS] Replace .prev, .next, .first, and .last with \prev, \next, \first, and \last, since the .-prefixes make SASS barf.
Fix demo css .prev and code style in UIView+NIStyleable.
Merge pull request #11 from djMax/relative-positioning

CSS Positioning improvements