Minimize the payload for npm.

Selectively choose which files to include in the module (for npm).
Currently, this is known to break npat=true when doing npm install.

https://code.google.com/p/esprima/issues/detail?id=493
https://code.google.com/p/esprima/issues/detail?id=510
Make npm test work on Windows and ignore node_modules directory

https://code.google.com/p/esprima/issues/detail?id=490
Link to the issue tracker from the package manifest

https://code.google.com/p/esprima/issues/detail?id=491
Manifest package.json must contain author field.

https://code.google.com/p/esprima/issues/detail?id=493