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.
First version of img2imgcoord and img2stdcoord
fixed typo
bugfix: for unknown reasons WarpUtils produced wrong command lines
bugfix: for unknown reasons WarpUtils produced wrong command lines (ii)
fix:docstring of traits.Directory was not correctly generated
fix: support for FSL 5.0.7 changes to FILM_GLS
enh: added script for using ANTS instead of FNIRT for openfmri processing
sty: white spaces
Merge pull request #899 from satra/fix/fsl_507

FIX: updates to address changes in FILM_GLS and FSLMaths in FSL 5.0.7
Fix: warnings complaining the IPython lexer

When building docs, sphinx was spiting out warnings because IPython's
lexers are unknown. Added the necessary extensions to sphinx config
file.
Merge pull request #901 from oesteban/bug/AddIPythonLexer

Fix: warnings complaining about unknown IPython lexer
changed use of os.unlink in favour of os.remove
correcting docstrings of the utils file
Merge branch 'master' into enh/FSLimg2coords

Conflicts:
	CHANGES
Merge pull request #888 from oesteban/enh/FSLimg2coords

FSL new interfaces: img2imgcoords and img2stdcoords
Merge branch 'master' into fix/ElastixDocumentation

Conflicts:
	nipype/interfaces/elastix/base.py
fix:docstrings
Merge pull request #905 from oesteban/fix/ElastixDocumentation

Fix elastix documentation
Merge branch 'master' into bug/fnirtfileutils