Fixed voxel text input in Volume Viewer example. Fixes #39.
Merge pull request #40 from tsherif/example_voxel_fix

Fixed voxel text input in Volume Viewer example. Fixes #39.
Fixed bug in volume slice method defaults. Fixes #41.
Merge pull request #42 from tsherif/slice_series_fix

Fixed bug in volume slice method defaults. Fixes #41.