Use modern Ruby/Rails style guidelines
Merge pull request #438 from psu-stewardship/use_ruby19_hash_syntax

Use modern Ruby/Rails style guidelines
Refactor the file controller update method for clarity
Merge pull request #439 from projecthydra/refactor_update

Refactor the file controller update method for clarity
Cease auto characterizing on save.
Instead run the characterization from the FilesControllerBehavior. This
makes testing far easier. Fixes #232