Added bytecode parser according to c0vm-writeup.pdf

We can now parse a bytecode file to find int_pool, string_pool,
function_pool, and native_pool.

src/index.js

@@ -4,3 +4,6 @@ console.log("Reading in sample bytecode file:");
 console.log(parser.getBytes("../test/test.bc0"));
 console.log("That was the sample bytecode file" +
             " -- it probably took up your whole terminal screen.");
+var file = parser.parse("../test/test.bc0");
+console.log(file);
+console.log(file.function_pool[0].code);