add ExtractMainComponent interface
Created slurm launcher for workflow plugins

This hasn't been well tested but it should work without too many issues. Of particular note are the environment variables that we're referencing. Those commands have the capability to fail with no error and need to be watched closely.
Added new interface for mesh/contour handling

Added base code, just for computing node-to-node distanced.
Some other computations could be added here.
Fix: input_spec and output_spec were not set

Fixed bug in surface-to-surface distance computation.
Implementation of surface weighting

Also fixed total weight normalization
Fixed bug

Input parameter name was used wrongly
Merge remote-tracking branch 'origin/enh/MeshAlgorithm' into enh/MeshAlgorithm
Working version

Checked that works with vtk files. Also checked for consistency when
using the same surface twice.
Fixed misnamed variable causing crash.

_sbatch_args was incorrectly called _slurm_args in one of the if
statements in slurm.py causing a crash. Added in a load .slurm to
__init__ as development env had plugins in PYTHONPATH. Moved slurm
plugin base to base.py instead of slurm.py
Added support for sbatch args to slurm module.
Added mandatory args for SLURM, fixed regex for batch job number

Added in several defaults for mandatory arguments to sbatch. Also the
regex that finds the job number was malformed and was returning 'None'
for all batch jobs. That's been fixed and is now returning jobs
correctly.
Merge branch 'master' of https://github.com/ChadCumba/nipype
Fixed a typecasting bug on some systems

strict python interp was killing o.find(<int>). typecasted to str.
Organizational changes per Satrajit's requests.

Removed base.py slurm base class and instead rolled it all into
slurm.py SLURMPlugin class, which now inherits
SGELikeBatchManagerBase. Also changed the default queue time to 1 hour
as users did not like default 48 hour queuing.
Base commit splitting the dti utilities

A new preprocess file will contain all workflows regarding preprocessing
of EPI images.
Merge branch 'master' into enh/freesurfer

* master: (255 commits)
  fix: version property
  doc: added pointer to ants example
  fix: removed cma to freesurfer mapping, updated docs and pointed to atlas/template downloads
  fix: remove np deprecation decorator and moved imports to run_interface.
  fix: explicitly test for nipy version and remove imports to specific interfaces closes #648
  Added FuzzyOverlap to changelog
  fix: set slice_times as seconds outside workflow generating function
  fix: replaced plugin_args with proper arguments
  enh: replace realignment routine with newer Nipype interface for Nipy's newer class
  enh: added SpaceTimeRealign from nipy 0.4.dev
  api: always run datasink and let copyfiles decide if things need to be copied or not. in case inputs are directories, this will allow refreshing outputs.
  fix: moved imports for dicominfo outside of the function
  fix: use ceiling of slice thickness for erosion purposes
  fix: add imports to the functions
  enh: compressing more into functions
  enh: replaced erosion with slicethickness and added epimask support for bbregister
  fix: updated ants example to use new parameters from ants
  tst: fixed ants doctests to indicate smoothing sigmas
  enh: updated antsApplyTransforms to accept input image type
  api: changed smoothing sigmas to accept float in antsRegistration
  ...
Merge branch 'master' into enh/freesurfer

* master:
  fix: afni url in afni package
  added more documentation
  Added dummy files
  fixed inputs for Retroicor
  adding retrocicor to __init__.py
  addition of 3dretroicor interface, very basic version
  enh: allow naming a workflow
  microseconds
  microseconds
  fix:total_seconds_python2.6
  fix: missing template
  enh: updated mindboggle atlases
  DOC: Add short doc page for SelectFiles
Renamed susceptibility pipeline

Since I'm to replace this workflow, I rename it with its ``classic''
name. The new pipeline will be based on the latest versions of
```fsl_prepare``` and ```epi_reg``` of FSL.

Additionally, my intention is to provide with an interface for
the new tool ```topup``` and a new workflow for T2-to-B0 registration-based
correction.
Extracted EPI-specific interfaces from utils & dti

Created a new file for adding EPI-related interfaces.
Base files for new epi interfaces

Added base classes for interfaces fsl_prepare_fieldmap, topup and applytopup