Additional functionality for phasemap manipulation, masks and more plots.

phasemap: Now supports flips, rotations and shifts with ndimage.
          Added plot_phase_with_hist to plot histograms (for difference plots).
fielddata: FieldData now properly plots contours and masks (new).
dataset: set_3d_mask now uses the new mask capability of FieldData.
         Default is no longer "logical backprojection".
io_phasemap: Now includes .tif (although that does not always work).
setup.py: Deleted deprecated depencencies.
Renamed a few plot commands to plot_...
Rollback to RdBu as colormap (back from Spectral).