Various Fixes

I actually referenced a similar project (for NASM) quite much:
https://github.com/Nessphoro/sublimeassembly

First change should be obvious, change advertised syntax name from "MasmAssembly" to "Assembly x86 (MASM)", may it should be "Assembly x86 (MASM/JWasm)".

Second change maybe controversial. I seriously don't think most people actually want a new color scheme, so remove it. For me, I just want default Monokai.

Third change is that I changed various names of patterns. But new names are from what is used in sublimeassembly. After the change, there are highlights in Monokai now. I haven't changed anything ended with jwasm as I'm not familiar with JWasm (yet).

Thank you for your work anyway.