Fixing asm.js node module

[padolsey]

Hi Dave,

If you're already working on this or there's something else in the pipeline, or if this pull request is generally off the mark, please disregard.

---

Currently main in package.json points to lib/asm.js which doesn't exist. I've created a lib/asm.js -- it just includes the basic stuff an asmjs-node-module consumer might want to access (at the moment: validate, types, ValidationError).

I also noticed the nodeunit tests were not succeeding so I've restored tables.js (which was missing [?]). Tests succeed now:

$ nodeunit tests/index.js

index
✔ testModuloIntish1
✔ testModuleIntish2
✔ testIntCoercionRequiresDouble1
✔ testIntCoercionRequiresDouble2
✔ testNot
✔ testParamTypes
✔ testAdd
✔ testImul
✔ testLoad
✔ testStore
✔ testCall1
✔ testCall2
✔ testVoid1
✔ testVoid2
✔ testEval1
✔ testEval2
✔ testEval3

Also changed tests/asm.js to asmAssert.js for clarity and to avoid ambiguity with the new lib/asm.js.

Please let me know if any further changes are required.

[dherman]

Thanks for the PR!

[dherman]

Published to npm as 0.0.2.