Review FSL eddy interface

Just fixed PEP8 errors in the interface and reviewed the solution
for the bugs, that were already solved.

Please, close #769.
fix: spm12b compatibility
fix: revert back example
First version of img2imgcoord and img2stdcoord
fixed typo
Merge pull request #886 from satra/enh/spm12

fix: spm12b compatibility
Added some investigation to nonempty errors
improved exception passing
Adding a second check
Improved check
fix: matlab versioning
Merge pull request #891 from satra/fix/spmversion

fix: matlab versioning
fix: max_jobs plugin parameter now acts within the inner submission loop
New Freesurfer interface: MRIPretess
fix:added files to data folder so doctest passes
fix:docstring removed
bugfix: for unknown reasons WarpUtils produced wrong command lines
bugfix: for unknown reasons WarpUtils produced wrong command lines (ii)
Merge pull request #894 from oesteban/enh/FreeSurferMRIPretess

enh: Freesurfer mri_pretess
Merge pull request #890 from oesteban/bug/fixRemoveNonEmptyDir

Not empty folder in NFS errors