CMake: Change AS3 compiler-id in the toolchain.
CMake: Move PLATFORM_NAME variable to CACHE in the PNaCl toolchain file.
Lib: Align structure 'ecies_encrypt_message_header_t' to 32 byte. Force 'ecies_encrypt_message_header_t' structure storing in the little-endian format.
Lib: Add programs: 'stream_encrypt' and 'stream_decrypt' to show how to use the library for files encryption and decryption.