Implement read/write and key generation; TODO encrypt/decrypt is failing with BadPaddingExceptions
Add symmetric key test; still haven't fixed BadPaddingSize
Replace asymmetric encrypt/decrypt with UnsupportedOperationException
Rename test file and add delete key functionality
Change test author name
Merge pull request #1 from andrewsbrown/add-file-key-storage

In FilePrivateKeyStorage, implement generateKeyPair, generateKey, and encrypt/decrypt (for symmetric). Added unit test.