Normalizing license text to that of ProjectHydra

If we are going to bring this into the Hydra fold, then we should
align the license to reflect what was agreed upon by the Hydra
Steering committe.

https://github.com/projecthydra/hydra/blob/master/LICENSE.txt
Merge pull request #16 from jeremyf/normalizing-license-to-hydra-license-format

Normalizing license text to that of ProjectHydra