Start using generated standalone penthouse.js

The (standalone) penthouse.js is now generated,
thanks to the work of @kopseng.
The generated file has all required penthouse modules inlined,
meaning this single file can continue to be used standalone,
called from the command line, without installing Node.

This means we no longer have to maintain two single files
(lib/penthouse.core.js and penthouse.js)

Once again, thanks @kopseng!