RL: Perform voxel-by-voxel division (#82)

* RL: Perform voxel-by-voxel division

* Set zero clipping based on image max

* Bump version to 1.2.10

Update Travis credentials (#79)

* [TRAVIS] skip clean-up

Bump to v1.2.9

Merge pull request #78 from UCL/travis-creds

Update Travis deploy token

Merge pull request #68 from UCL/travis

[TRAVIS] Remove deprecated 'skip_cleanup'

[CI/CD] Update version number to 1.2.5

Bump version number to v1.2.4

Remove use of NULL. (#44)

Fixes #33 .