ENH: Add SkullStrip Remote Module

A Skull Stripping filter that removes face/skull from MRI data and
creates a mask for the brain. This is a common preprocessing step for
segmenting MRI brains and their contents.

NOTE: This algorithm is also availiable as a Slicer extension:
https://www.slicer.org/slicerWiki/index.php/Documentation/4.2/Extensions

Following the process here:
http://www.itk.org/Wiki/ITK/Policy_and_Procedures_for_Adding_Remote_Modules

1) A Skull-Stripping Filter for ITK Bauer S., Fejes T., Reyes M.
http://www.insight-journal.org/browse/publication/859

2) Nightly Dashboard
http://open.cdash.org/index.php?project=Insight&filtercount=2&showfilters=1&filtercombine=and&field1=site/string&compare1=63&value1=BillsAmazon&field2=buildname/string&compare2=63&value2=SkullStrip

3) Gerrit patch

4) Notify list

Change-Id: I4f6642516c0bee12b702f0a6313164e207b57bc3
Merge topic 'RemoteModule_SkullStrip'

ec68b944 ENH: Add SkullStrip Remote Module