Required for atom-hopper.

- Points to wadl-tools 1.0.15-SNAPSHOT which has a fix to no longer strip xmlns attributes within the wadl param element
during normalization.

- atom-hopper requires this for B-50883
Merge pull request #166 from usnavi/B-50833_param

Moving to wadl-tools 1.0.15-SNAPSHOT.  Required for atom-hopper.