OTCryptoOpenSSL: move functions into caller
OTCryptoOpenSSL: fix signature of callback definition
Merge pull request #285 from toxeus/OTCryptoOpenSSLCleanup

OTCryptoOpenSSL: cleanup declarations
Made OTContract::GetIdentifier(OTString&) non-virtual.
Removed unused Base64 functions in OTCrypto.
Added -Woverloaded-virtual to PEDANTIC_CXX_FLAGS
Merge pull request #286 from benma/cleanup

Removed unused (and hidden) base functions