HttpClient

## WORK IN PROGRESS

This is work in progress, but I wanted to get some initial feedback. 

* Added our own light Http(REST) Client. We use very small bits of RestSharp and I was writing more code trying to get it to behave the way we want so decided to write our own simple HttpClient and it ended up pretty light and we have full control over it's behavior.

* I moved DailySeries over to use this new class as an example.

### TODO in develop
* Remove HttpProvider
* Remove RestSharp



@markus101 @Taloth 
Use your new extension: `IsNotNullOrWhiteSpace`