Improve set_signal_type docstring.
Do not import EDSSpectrum in signals.py because TEM_EDSSpectrum or STEM_EDSSpectrum should be used instedad
BUG-FIX: plotting was sometimes raising an exception due to tight_layout current brittleness.
BUG-FIX: correct indentation.
Fix blank lines to comply with PEP8
Fix blank lines to comply with PEP8
Merge branch 'master' of https://github.com/hyperspy/hyperspy

Conflicts:
	hyperspy/signal.py
Merge branch 'master' of https://github.com/hyperspy/hyperspy

Conflicts:
	hyperspy/signal.py
Merge branch 'master' of https://github.com/hyperspy/hyperspy

Conflicts:
	hyperspy/signal.py
Replace warning_exit by ValueError
BUG-FIX: MVATools.decompositon, MVATools.normalize_poissonian_noise and misc.eels.tools.estimate_noise_variance where assuming that after unfolding the fist data axis was the navigation axis what is not generally true. Added decomposition tests.
Merge pull request #115 from francisco-dlp/BUG-FIX_wrong_unfolded_assumption

Bug fix wrong unfolded assumption
Small style corrections
Fixes #121: spikes_removal_tool was causing a stack overflow
Merge pull request #122 from francisco-dlp/BUG-FIX_remove_spikes

Bug fix remove spikes
BUG-FIX: hdf5 files containing non-ascii characters were raising an exception on saving.
Merge pull request #123 from francisco-dlp/BUG-FIX_unicode_in_hdf5

BUG-FIX: hdf5 files containing non-ascii characters were raising an exce...
Merge branch 'master' into ENH_zlp_centre

Conflicts:
	hyperspy/signal.py