Merge remote branch 'origin/master'
ENH: Concatenate the array elements in the command line array before printing them. This makes debugging easier by allowing to directly copy/paste the command line that the python script used
ENH: DTI is skullstipped if a brain mask is computed. This avoid  tracking fibers outside of the brain if the image is noisy
Merge branches 'concatenatePrintCommandLine' and 'master'
Merge branches 'maskBrain' and 'master'