Closure fix; force cast from Element to Node.
Closure tweak: variable 'd' declared twice within the same method.
Closurize dygraph-options.js. Not done.

Also fix bug: this.labels_ was never used! Booo...
Closure fix type Dyraph->Dygraph.
Closurize rgbcolor.js
Some closurifying dygraph-canvas and dygraph-layout.
BUGFIX: First try of fixing missing data bug for customBars and errorBars
TEST: test to verify the bugfix
REFACTORING: moved option retrieving out of the for loop for better
performance.
TEST: Added examples for the bugfix.
Merge branch 'master' of github.com:danvk/dygraphs into closure

Conflicts:
	dygraph-options.js
Reponses to code review for https://github.com/danvk/dygraphs/pull/237
BUGFIX: added missing spaces.
TEST: Added automatet tests for customBar and errorBar options and missing data points.
REFACTORING: Changed if / else cases to optimize the performance for the
default cases.
TEST: Added NaN cases to the missingPoints test.
Follow-on to pull request 237, closurifying some code.
Merge pull request #237 from kberg/closure

Fix closure bugs in Dygraphs
Merge pull request #245 from sauter-hq/custom-bar-data-gaps-459

Custom bar data gaps 459
Merge pull request #246 from davidmsibley/master

Quarterly granularity ticker fix