v3.0.0

• Using latest version of emscripten (1.37.0) to compile; resolves some compatibility errors
• Optimized output dasm.js via -O3
• Only the last pass is used in the "list" file output
• Resolved one dasm C99-compatibility compilation error
• (Minor) Added a script to compile dasm.js from its source code with no manual tweaks needed
• (Minor) Added the dasm source to the repository
• (Minor) Documentation updates
• (Minor) Test updates