-Implement event handling for device picker on graph page
-Refactor graphing and URL generation functions to allow fetching from any device picked
-Use d3.extent instead of d3.max/d3.min and base y-axis of graph on min and max values from data set
-Add some helpful comments
Merge branch 'master' of https://github.com/chrisknepper/in-glass
-Add check to make sure temperature object isn't empty (sometimes server doesn't send it properly, which causes the JS autoupdating to die)