Corrected behaviour for CBC-based suites using the SHA384 MAC and PRF
Added ECDHE-based SHA256 and SHA384 ciphersuites

Added TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384,
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 and
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 ciphersuites