rename snowgraph to rangepickerGraph, set a node reference to the container in Timeline
Separate timeline (no altitudes) and snowgraph (altitudes)
The snowgraph always shows all days at the moment
Update moment.js to 2.0
add methods to get first and last selected date from DataController
* dataController#getFirstSelectedDate
* dataController#getFirstSelectedDateIndex
* dataController#getLastSelectedDate
* dataController#getLastSelectedDateIndex
Snowgraph: only show selected timeframe
Fix snowgraph bugs, draw lines for days