Merge branch 'release-0.2.0' into develop
Bump version to 0.3.0-SNAPSHOT.
Update README with usage info.
Initial exploration of BouncyCastle OpenPGP.

Just some basic load keyring/print key info functionality so far.
Factor config code into vault.tool.config ns.

This enables a neat way of specifying multiple config files and merging
the results together.
Add 'config dump' command to show config map.
Add errant static-set schema file.
Merge branch 'tool-configs' into develop
Checking in a bunch of crypto work.
Upgrade BouncyCastle library versions.
Fix some bugs in vault.crypto/print-key-info.
Signature generation, encoding, and decoding.
Implement PGP signature verification.
Add cryptography docs.
Update objects doc.
Rename schema doc to data-structures.
Clean up crypto ns a bit.
Merge branch 'crypto-work' into develop
Allow memory stores in configs.
Minor changes to schema examples.