Bower integration

1 ) Merge in the bower pull request from me.
2 ) $ bower register bitcoinjs git://github.com/bitcoinjs/bitcoinjs-lib.git
```javascript
  "authors": [
    "Daniel Cousens <github@dcousens.com>",
    "Kyle Drake <kyle@kyledrake.net>",
    "Wei Lu <luwei.here@gmail.com>"
  ],
```