updated ROI extraction
ROI example: second version
Now Subplots and boxplots
PEP8ized + more intuitive variable names
Fix typo in error message
Merge commit 'refs/pull/259/head' of https://github.com/nilearn/nilearn
reorder_img 'resample' argument sets interpolation resampling

Also:
* niimg variable names should end with _img in test_resampling.py
* fix PEP8 and typo axis -> axes
* add value of interpolation in resample_img error message