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.
dygraph-utils.js: isElementContainedBy -> isNodeContainedBy

This fixes a type nit when using the Closure Compiler, since walking
parentNode can give an Element or Document node, not just an Element.
dygraph-tickers.js: Fix variable redeclaration
dygraph-utils.js: Remove trailing white space
dygraph-utils.js: Make Dygraph.error and Dygraph.update public

These seem like reasonable utility functions, and they were used outside
of Dygraph (specifically in DygraphOptions). Making these non-private
resolves Closure Compiler warnings inside dygraph-options.js.
Make dygraph-options.js warning-free under Closure Compiler
BUGFIX: xAxisLabelHeight is set to 0 in case the option 'drawXAxis' is
set to false.
Merge pull request #233 from lucasbergman/master

some small Closure-cleanliness fixes
TEST: Added automated test proving the bugfix made.
TEST: Added example of range selector without the chart.
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.
BUGFIX: Fixed typo