Removed mondrian dependency; changed dimensionType property from Dimension.Type to String to allow for gwt compile.
Made several ui changes to accommodate Brett's feedback:
- removed question mark for "Time Dimension" label
- changed "UNique members?" label to "Contains only unqique members"
- added bindings to show/hide the clear ordinal column button.

Added an editable menulist for the time format.
Unfortunately it looks like the "editable" attribute is not yet implemented in the pentaho ui stack for menulists.

Cleaned up the showing/hiding of elements specific to time dimensions:
- added utility method to show/hide a container
- put time dim items in a container, and geo items in a container.
- changed code to hide / show said containers
Image for button to invoke help on the time format.