adding trim interface that keeps the original dtype storage
enh: composite norm based on eigenvectors of the brain mask coordinates
fix: removed transpose
sty: removed commented out section on eigenvector transform
fix: matplotlib backend set to agg, deprecation warning

set to agg to ensure multiproc plugin can be used.
deprication warning for new flag "bound_by_brainmask"
enh: added AFNI support

removed Siemens option - was not supported anyway.
fix: pep8, return parameters to conform to nipy to_matrix44
* enh: added voxel displacement maps, support for afni

* sty: some pep8 cleanup
* fix: convert nipy motion parameters to matrix using nipy
* api: added option to use particular threshold when creating brain mask internally
* enh: save mask used for global signal calculation
sty: pep8 cleanup
Merge branch 'master' into enh/rapidart

* master:
  Fixed afni test
  Fixed AFNI tests.
  Escape the expr parameter in 3dcalc.
  fixing TSNR integer data bug
  ENH: Provide access to all relevant BET outputs when "surfaces" option used.
fix: rapidart tests
fix: fsl version test
Merge branch 'master' into enh/rapidart

* master:
  Removed unnecessary usedefault.
  fixed typo in a file name
  fix: github authentication
  Going back to distinguishing affine transformations by names. Improved docs.
  fixed typo in randomize parameters
  Removed unnecessary copyfiles and added output_image option.
  BF: Pass plugin_args to child nodes of MapNode
  ENH: Don't require ordereddict for python < 2.7
  BF: Fix for plugins when using python2.7
  Fixed parenthesis.
  Fix fslreorient2std output collection
  Allow FNIRT to take standard names as reference.
  BF: Check plugin_args is not None before accessing it like a dict.
fix: afni orientation info
Merge branch 'master' into enh/rapidart

* master:
  fix: fsl tests
  sty: white space
  fix: automask bug when apply_mask is not specified
  fix: updated test writer with additional metadata
  fix: remove unnecessary print statement
  fix: trim http link for code
  fix: github url generation
  fix: return full hash
enh: added versioning to traits and interfaces
fix: only check for version compatibility when inputs are defined
fix: version check and tests
enh: added version info to fsl, spm and freesurfer
sty: pep8