ENH: add **kwargs for get_histograms
EHN: doc
BUG-FIX: yaxis scale and offset is conserved
ENH: doc2
Merge pull request #166 from pburdet/BUG-FIX_overlap_yaxis_conserved

BUG-FIX: yaxis scale and offset is conserved
Merge pull request #165 from pburdet/ENH_get_histograms_kwargs

ENH: add **kwargs for get_histogram
Merge branch 'master' of https://github.com/hyperspy/hyperspy into model_as_dict
not fully done, but recreating from dictionaries in progress
seems to be working, not yet integrated with usual creation routines