New Features

Added safe curl command for arbitrarily executing HTTP queries
against a safe target. This allows you to authenticate to Vault,
and hit the raw APIs for experimentation.
Added safe cert command for issuing signed certificates using
Vault's PKI backend.
Added safe revoke command for revoking certificates issued
using Vault's PKI backend.
Added safe crl-pem command for displaying the Certificate
Revocation List (CRL) in PEM format, pulled from Vault's
PKI backend.
Added safe ca-pem command for displaying the Certificate
Authority certificiate in PEM format, pulled from Vault's PKI
backend.

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