Update dygraphs version from 1.0.1 to 1.1.0

New Dygraphs has a bunch of improvements we want. The most important is
non-blurry rendering for retina displays (I didn't even notice it was blurry
until seeing the new version) and cleaner dates on the x-axis.

Dygraphs release highlights (from dygraphs site):
 - dygraphs is now "retina" compatible.
 - Dramatically improved performance for filled charts (i.e. fillGraph)
 - More sensible date ticks: "Jan 08"→"Jan 2008", "29Jan"→"29 Jan"
 - Using a non-existent option now throws (w/ dygraph-combined-dev.js)
 - x-axis log scales
 - The labelsUTC option forces UTC formatting for all labels.
 - The new DataHandler system allows for more flexibility in data loading.
 - this is set to the dygraph in all callbacks.
 - dygraphs has shrunk, because we moved some stuff into "extras" (133kb→122kb)