BUG-FIX: update colorbar when chaning image
Use blit to speed up image drawing
BUG-FIX: errors were raised when hovering the mouse pointer over an image axis where there is no image data
BUG-FIX: when updating the image the optimized vmax and vmin were not used
BUG-FIX: reading DM files in Windows was failing because the file was not open as a binary
BUG-FIX: the colorbar colors were not updated what was a problem when the first image of a set had no constrast
Merge pull request #97 from francisco-dlp/ENH_image_plotting

Enh image plotting
Remove unused mpl_traits_editor
Make Hyperspy work with Qt and PySide and set Qt as the default backend
Make hyperspy work without X server
Enable running hyperpsy using the inline IPython pylab backend. Also enable choosing the toolkit and pylab_online in preferences
BUG-FIX: the msa files were not being added to the distribution
Correct version, back to dev
Merge branch 'master' into ENH_toolkit_choice
BUG-FIX: hyperspy/tests/drawing was wrongly placed in setup.py
Merge branch 'master' into ENH_toolkit_choice
BUG-FIX: IPython version < 1.0 did not work due when choosing gui=qt4
Also check if sip is installed
Update api doc
Merge branch 'master' into ENH_toolkit_choice