Normalization of atoms
Fix bug in XCode 5.1
Normalization of kernels
Updated upper-bound for LASSO
Fix visualization
Allow for negative values in coeff vector

This is needed in case of advanced spectral projected gradient methods,
where A can be multiplied by the gradient
Revert "Allow for negative values in coeff vector"

This reverts commit 78abfcbd4926d7008c0e43eb4c015e9ec781a460.
Revert "Revert "Allow for negative values in coeff vector""

This reverts commit 6b69d19ef777c8de56133f901cdf858f37a360df.
Revert 6b69d19..e2f2286

This rolls back to commit 6b69d19ef777c8de56133f901cdf858f37a360df.
Allow for negative values in coeff vector

This is needed in case of advanced spectral projected gradient methods,
where A can be multiplied by the gradient
Added tck2trk

Converts fibers from .tck (mrtrix) to .trk (dtk)
Small modifications
Atom normalization
Adapted tutorial to new normalization approach
Merge branch 'master' of https://github.com/daducci/COMMIT