Added crypto plugin encryption to Secrets post.
Added decrypt via plugin.
Removed barbican.crypto.fields module.  Use plugin system instead.
Fixed order test.
Merge upstream policy changes.

Conflicts:
	barbican/api/resources.py
Fixed tox tests broken by upstream commits.
pep8 fixes.
Merge pull request #51 from dmend/master

Added encryption plugin framework.
Release for v0.1.39
Prepare for next release
Release for v0.1.40
Prepare for next release
Added support for restricting GETs of expired secrets; Set default page size to 10 records;
Merged Douglas' changes; Updated debian installer to install stevedore package;