Added PolarSSL as a submodule
Replaced OpenSSL BigNum with PolarSSL mpi
Replaced OpenSSL SHA1 with PolarSSL SHA1
Replaced OpenSSL SHA256 with PolarSSL SHA256
Replaced OpenSSL RIPEMD-160 with PolarSSL RIPEMD-160
Replaced OpenSSL RAND_bytes with PolarSSL random funtionality
Replaced OpenSSL ECDSA with PolarSSL ECDSA
Replaced OpenSSL AES256-CBC with PolarSSL AES256-CBC-HMAC