This change-set addresses two JIRA items to help
the idemix-bccsp integration in Fabric-ca

Change-Id: I1c202831fa43287d877340037f9bdc93f6665f0e
Signed-off-by: Angelo De Caro <adc@zurich.ibm.com>

This change-set provides a BCCSP implementation
supporting the idemix opts

Change-Id: Ia675ba19f07a464bbb01110a48276557d6ba2f13
Signed-off-by: Angelo De Caro <adc@zurich.ibm.com>

This change-set does the following:
- implement the credential request signer/verifier
- tests

Change-Id: I7b6e360babced2da824cc1abfa13ed8ba97854c8
Signed-off-by: Angelo De Caro <adc@zurich.ibm.com>