For Bower, switch to bower.json.

https://code.google.com/p/esprima/issues/detail?id=342
Some keywords for the package manifests.

https://code.google.com/p/esprima/issues/detail?id=4
https://code.google.com/p/esprima/issues/detail?id=342
Minimize the payload for bower.

https://code.google.com/p/esprima/issues/detail?id=342
https://code.google.com/p/esprima/issues/detail?id=362