shut up, bothering bower!

bower asks for permission to send usage reports, which disturbs the installation process
```
[?] May bower anonymously report usage statistics to improve the tool over time? No
```
tell him to shut up with this

also use npm's bin command to get the local bin folder https://www.npmjs.org/doc/cli/npm-bin.html
better yet `npm install --dev --no-optional``

I don't know why npm can't have sensible defaults.