Removed kryptnostic-service, as it is back-end scaffolding
Updated license to comply with CERN COLT licensing
Implemented homomorphic function generation.

- Added direct function encryption operation to the private key, so that
  it can be used to encrypt plaintext functions. This also allows for
  encrypting plaintext functions composed with the decryption circuit,
  the basis of fuly homomorphic operations.

- Added homomorphic function computing operations to the private key.

- Added unit test that demonstrates homomorphic xor operations.
Updated readme