Added api file. Data range attempt
Separating data operations from ui. Step 1.
Separating data operations from ui. Step 1.5
Separating data operations from ui. Step 2. Finally moved data manipulation.
Separating data operations from ui. Step 2.5 Realtime update is back.
Add drawing selection
Range selection boxes update
Merge branch 'master' of https://github.com/lanseg/sensors