Added b intheknow service and feed manager

Ive added a service to get the bintheknow feed from tumblr and a controller to manage the auto loading process.

added unit tests - integration tests to follow
Very minor comments... And its just me being pedantic rather than code style. Can we pick a different word to ```Manager``` as its a bit of a noise word. 

You don't have to make these changes if you have a better idea. But I would probably go for.

```feedPoller``` and then call the public method ```start```.