The status and version badges should link to Travis-ci and NPM

**As a** developer 
**In order to** ensure the status badge reflects the latest build status 
**And** to be able to see the test suite at Travis-ci 
**And** to be able to get more details about the package from the NPM home 
**I want** the status and version badges to be included in the `README` in the standard way 

Hello @Wildhoney,

This is a very minor improvement, but I think the _EmberDroplet_ test suite is worth to be made visible ; )