Fixed active/cached-doc comparison to actually compare the documents. Fixed a bug where the dialog would try to update when cinema was first booting and couldn't find any living active documents.
Added iter-all.pyp - a command plugin which demonstrates iteration of: objects, tags, materials, and layers of the active document.

Updated iter-hierarchy.pyp to correct for some typos and references to C++ SDK files.
Killed todo-list.pyp, as it was a duplicate of another SDK example.
Rebased w plugin cafe and deleted todo-list.pyp.
Merge remote-tracking branch 'origin/master'