Various changes to MRI dataset.
Added corruption to MRI.
Added unit normalization to MRI.
Kurtosis and skew analysis to mri_nifti
removed init bias
Added reconstruction error to vae monitors.
Merge branch 'vae' into nitools
Ongoing development of MRI and NICE
Added distorter to MRI datasets.
Evened input of MRI with NICE.
Random typoes.
Added specrum to MRI NICE analysis.