Updated the package.json file

- Modules versions
- GitHub URL (bpierre => lisezmoi)
Express 3.0 compatibility

I also moved the JS compression function in its own module.
Coding style

Variables declaration: one var statement per line.
Coding style
Handle V8 structuredStackTrace.getFunctionName() (fixes #37)

StructuredStackTrace.getFunctionName() can return `null`.
Fixed API changes in the pierre/default (demo) modul
Updated package description
Dev is now the default environment