Added new computation for sigma
changed a comment
new function to compute image noise
added more comments
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
Merge branch 'master' of https://github.com/vistalab/vistasoft into vs_mrtrix
ENH: Working on some files related to MRTRIX to make the tensor -baed trcking work