Merge branch 'master' into ENH_dm4

Conflicts:
	hyperspy/tests/signal/test_1D_tools.py
Let the dm reader guess the axis names.
Add verbose argument to dm reader
Remove unused DictBroswer
Remove unused read_data_array
DM reader: Reorder the RGBA fields
Add new testing files to setup.py
Merge pull request #93 from francisco-dlp/ENH_dm4

Add dm4 reading capabilities
BUG-FIX: plotting signals with nav_dim > 0 and sig_dim == 0 was raising an error in the first attempt and working afterwards. (Reported by Magnus)
Merge pull request #96 from francisco-dlp/BUGFIX_plot_signal_dimension0

BUG-FIX: plotting signals with nav_dim > 0 and sig_dim == 0 was raising ...
Merge branch 'master' into ENH_FEI_reader