Fix setSaturation JavaDoc

Should be saturation level, not exhaustion level.
Merge #69

commit 56e2c72764eff3f127a45f09e8d56e9f0ae7d9f8
Author: GJ
Date:   2014-02-01 11:05:16 -0500

Fix setSaturation JavaDoc

Should be saturation level, not exhaustion level.