Add plotting RGB(A) image stacks
RGB image files are now read with the RGB dtype and can be plotted
Updrade tifffile to version 2013.05.02
Add reading and writing RGB tiff files and improve. In addition the axes names and tags of tiff files are now read where possible
Merge branch 'master' into ENH_plotRGB
Disable colorbar when plotting RGB
BUG-FIX: when writing to tiff the photometric tags was not properly set what was causing problem on loading (reported by P. Burdet)
Add uint <-> RGB conversion to change_dtype
Add RGB tests
Merge branch 'master' into ENH_plotRGB

Conflicts:
	hyperspy/drawing/image.py
	hyperspy/signal.py
BUG-FIX: conversion to RGBA was failing for non-contiguous arrays
BUG-FIX: RGB16 images were not plotting properly
Added chi-squared and reduced chi-squared to model class. They are both signals at the moment, so could be slow.
Also added option to make progress bar for as_signal() optional.
fixed missing reference to data of chisq
will have to redo, removed additional changes to be moved to other branches
corrected implementation of chi squared. Reduced still not present
Merge branch 'master' of https://github.com/hyperspy/hyperspy into chi_squared
added reduced chi squared calculations (as a property)
removed unnecessary comments and blank lines
added titles for chisq, red_chisq and dof