Bug: not legend for overlap
ENH: add doc for overlap
EHN: some small modification
ENH: modify the structure of the chapters
SUP: suppress plotting different navigators
ENH: plot histogram
DOC: write doc
DOC: example
DOC: docstring
DOC: udpate docstring
DOC: make the link works
DOC: make the links works
Merge branch 'master' into DOC_plot_spectra_overlap and change
plot_spectra_overlap example, add example description and correct broken link
to plot_spectra.

(sorry for mixing a merge with another commit)

Conflicts:
	hyperspy/drawing/utils.py
ENH: plot intensities with plot_signals
Minor improvements to the plot_spectra doc
Merge pull request #172 from pburdet/ENH_plot_signal_for_EDS

ENH: plot intensities with plot_signals
Merge branch 'master' of https://github.com/hyperspy/hyperspy
Merge pull request #169 from pburdet/DOC_navigator_options

Doc navigator options
Merge branch 'master' into DOC_plot_spectra_overlap

Conflicts:
	hyperspy/drawing/utils.py
Merge branch 'DOC_plot_spectra_overlap' of https://github.com/francisco-dlp/hyperspy into DOC_plot_spectra_overlap

Conflicts:
	doc/user_guide/visualisation.rst