Merge pull request #1 from hemslo/develop

Init project framework
Add basic api client

Init API Client.
Add access_token operation to client

Add access_token's CRUDL to client.
Add datastream operations to client

Add datastream CRUDL operations to client.
Add datapoint operations to client

Add datapoint CRDL operations to client.
Merge pull request #2 from hemslo/feature/client

Feature/client
Add AccessToken Manager and Model.

Add AccessTokenManager.
Add AccessToken Model.
Add datastream manager and model

Add Datastream Manager.
Add Datastream Model.
Add datapoint manager and model.

Add datapoint manager.
Add datapoint and dataset model.
Merge pull request #3 from hemslo/feature/manager

Feature/manager