got rid of boost_regex
  Though using a static version of the library, it was making maya crash on OSX
  because it was ending up calling the boost function from another shared library

optimized scene updates when ignore options are used
  This will improve performance when many AbcShape reference the same file with
  different object expressions
further optimized sample reads when using many AbcShape reference the same alembic file
fixed transform bounds drawing (was not respected AbcShape parent transform)
Adding edit mode to AbcShapeImport command (still some issues left with anim curves)