Fixed endianness in Curve25519 implementation (no consequence on security). Also added new Curve25519 code for 64-bit platforms.
Added optimised implementation of P-256 that uses 32->64 multiplications (MUL31).
Activated Curve25519 support for ECDHE cipher suites.
New implementation of Curve25519 (using multiplications of words of 15 bits or so, should be much faster on Cortex M0).
New basic implementation of Curve25519 (generic i15 code, experimental).