Fixing tests 1 - 38.

Found a few edge cases where problems arose:
  1) _getContainerEl needed to handle situations where tbody doesn't exist in the table.
  2) detachedRendering does indeed need the appendChild method.
  3) selected collectionViews needed special attention during removal of an element.
  4) Fixed up some spacing issues and added a findIndexByCid method to Backbone.BabySitter code.