BF: Residuals need to be considered both above and below.

Also, lsqnonlin seems to perform better than fminsearch in recovering the true
tensor parameters: https://gist.github.com/arokem/990983ad77b93f7c0559
BF: Fitting after outlier-exclusion should not use sigma weighting.
Mean-normalize the GMM weights.
Merge pull request #94 from arokem/restore_fixes

BF: Residuals need to be considered both above and below.