cropping
cropping
added 1 voxel padding and altered tests correspondingly
Added docstrings
added crop_img to nilearn.image.__init__.all
Added cropping before masking in the case where masking necessitates resampling. Also resampling in filter_and_mask is now done explicitely on the parameters of the mask and not the ones specified in 'parameters'
COSMIT incorporated Gael's comments
Merge pull request #121 from eickenberg/cropping_function

MRG: Cropping function