Add ejtp-crypto script
Implement ( encode | decode ) ( id )
Implement -f option in ejtp-crypto script
ejtp-crypto create IdentityCache only if it has an id parameter
ejtp-crypto support to json encryptors using 'with' key)
Add ejtp-crypto support to sign and sig-verify
sign command returns only the signature and sig-verify receive a --sigfile parameter
ejtp-crypto tests pass in all Python version >= 2.6
Merge remote-tracking branch 'silvio/ejtp-crypto' into development