include 3dAFNItoNIFTI command in interfaces.afni
include AFNItoNIFTI in module init file
now able to set prefix and file extension automatically NIFTI
added hash_file protocol and dummy test file
enh: update internal prov to latest version of external library
Merge pull request #664 from satra/enh/provupdate

enh: update internal prov to latest version of external library
added changelog information
Merge branch 'enh/afni2nifti'

Conflicts:
	CHANGES
	nipype/interfaces/afni/__init__.py
	nipype/interfaces/afni/preprocess.py
Merge remote-tracking branch 'upstream/master'
Extended nipy.Similarity to be computed on 4D

Now the interface is able to report one similary score for each
timestep in a 4D (3D+t) series.
Added explanation in CHANGES