fix crash when numeric module names are passed as cli args

If you pass a numeric module name to the browserify CLI in arguments such as ignore, exclude, require etc, it usually crashes. Came across this when trying to include the [66 module](https://www.npmjs.org/package/66).

I made sure optimist parses these arguments as strings, added aliases and removed concat calls that were no longer needed. Also added a test to prevent a regression.