Add test suite for DygraphOptions object. Fix broken method in it.
Merge pull request #238 from kberg/master

Add test suite for DygraphOptions object. Fix broken method in it.
#Bug 333: Support for passing point index to drawPointCallback and drawHighlightPointCallback added
Added idx parameter to option-reference
Code formatting
Added test for passing the correct idx to pointDrawCallback and hightlightPointDrawCallback