emscripten submodule bump version to 1.7.8
Added crypto++ src Version 5.6.2 - 2/20/2013
Integrated encryption and key derivation function

--Added tests
    test_aes
    test_derive_key

--Changed  encrypt/Makefile to make with different TARGETs like HTML JS BC or
native w/o specified target.
Added AES enceyption and decryption support in extension
Updated infrastucture to build extension
Small but critial fix in extension