Use nilearn plotting functions in plot_haxby_mass_univariate.py
Use nilearn plotting functions in plot_localizer_mass_univariate_methods.py
Use nilearn plotting functions in plot_oasis_vbm.py
Use nilearn plotting functions in plot_haxby_masks.py
Use facecolor and edgecolor when saving figure in gen_rst

On a black background, the white colorbar ticks were not visible in the saved figure
Merge pull request #298 from lesteve/gen-rst-facecolor-tweak

Use facecolor and edgecolor when saving figure in gen_rst
Fix examples broken by NiftiMasker len(sessions) check
Fix colorbar positioning when using 'axes' argument

The fourth argument of add_axes was using y1 instead of a width. Some cosmetic changes too
Merge pull request #301 from lesteve/fix-plotting-with-axes-argument

Fix colorbar positioning when using 'axes' argument
Merge pull request #297 from lesteve/use-nilearn-plotting-in-examples-bis

[MRG] Use nilearn plotting in examples bis
API: globally unifying niimg/img in functions/variables