Added volume.getIntensityValue() and color_map.colorFromValue()
getIntensityValue() for overlays.
Merge pull request #105 from tsherif/get-intensity-value

Get intensity value
Linted
Merge pull request #106 from tsherif/linting

Linted
Intensity values can be updated. Closes #97
Merge pull request #109 from tsherif/intensity-update

Intensity values can be updated. Closes #97
Painting example. Closes #110.
Merge pull request #111 from tsherif/paint-example

Painting example. Closes #110.