Bugfix for pepper_34.

Added initial support for PPB_Var;1.2 to fix the OpenGL example.
Defined a variable in common.mk to fix the PNaCl build.
Initial skeleton of web_socket wrapper for emscripten-nacl
pepper_35 is functional with emscripten toolchain
Merge branch 'pepper_35' of github.com:danielrh/pepper.js
added a websocket test skeleton
added preliminary testing for websockets