Added new computation for sigma
changed a comment
new function to compute image noise
added more comments
ENH:
  I added the code that allows for tracking fibers using the mrTrix toolbox.
  The code is added under vistasoft/externals/mrtrix
ENH: Removed file
Merge pull request #6 from frakkopesto/vs_mrtrix

ENH: Added code to call the mrTrix tool box from matlab
some more comments etc
finished bug checking dtiComputeImageNoise
Merge pull request #4 from jyeatman/robust_tensor

Robust tensor
Re-adding coords2Indices.m, as it was deprecated prematurely and is still necessary.
Merge pull request #7 from aspanu/master

Added indices2Coords.m into the main repo
updated functions so that they will return the resampled fiber group
changed the name of the output for fgResampled
Clarified the comments.
Tiny fix to comments
Now uses nifti format
Can now take a nifti struct as input
Use full paths rather than cd'ing around
Explicitly set the number of volumes