Update bower.json

[AntonyThorpe]

Include eventEmitter as a dependency in the bower.json file

[pscanf]

Closing as ddp.js is not published on bower anymore. I've made this choice because bower required dist files to be commited in the repo, a practice I preferred to move away from. I would consider though setting up a separate repo for dist files if there's enough demand for a bower package. Let me know.