Remove the RBSplitView framework and references.
Initial work on a new implementation of SplitView.
Implement pane toggling with some refactoring.
Remove the test. Support autosave names.
Doc updates.
Rename to SplitView2.
Rename the file.
Update to the current state of master.
Try to put the old SplitView and RBSplitView back in place.
Merge pull request #9 from typesupply/remove-rbsplitview-dependency

Bring the new SplitView into master.