Max Wolfe

Add token and pin initialization

1

Adding implementations and tests for C_InitToken and C_InitPIN Happens to also solve: https://github.com/danni/python-pkcs11/issues/6

Change DSA encoding to SubjectPublicKeyInfo

1

Currently DSA public keys are encoded as integers because RFC 3279 defines DSA public key encoding in that way. Unfortunately most Python crypto libraries don't natively support this (ex. [load_der_public_key](https://cryptography.io/en/latest/hazmat/primitives/asymmetric/serialization/#cryptography.hazmat.primitives.serialization.load_der_public_key))....