opencoin issuer

this is a C++ implementation of the opencoin protocol done as mapping to some kind of REST interface.

As all issuer related interactions of the protocol follows a request/response mechanism we are able to map all of them to Http-Requests.

We decided to use POST-Requests in all cases, as the protocol uses JSON-formatted messages for requests.

The following table gives an overview of the mapping of requests to URLs:

Request	URL	Response	C++ Interface Method
RequestCDDCSerial	/cddc/serial	ResponseCDDCSerial	cdd.cdd_serial of Model::getCurrentCDDC()
RequestCDDC	/cddc	ResponseCDDC	Model::getCurrentCDDC()
RequestMKCs	/mkcs	ResponseMKCs	Model::getMKCs
RequestMint	/mint	ResponseMint	Model::mint
RequestRenew	/renew	ResponseMint or ResponseDelay	?
RequestResume	/resume	ResponseMint or ResponseDelay	?
RequestRedeem	/redeem	ResponseRedeem	Model::redeem

actually the implementation is a work in progress.

TODO

[ ] select crypto library
- https://en.wikipedia.org/wiki/Comparison_of_cryptography_libraries
[ ] blinding utilizing crypto++
[ ] integrate session and login to make transactions account based
[ ] bookkeeping for accounts

What is signed as cdd - only the content of the cdd item with curly braces or also the key?
the weighted URL as array has a different js encoding as other elements
Clarify PSS usage (see https://crypto.stackexchange.com/questions/12707/usability-of-padding-scheme-in-blinded-rsa-signature)