Changed single quotes to double quotes.
Fixed bug where it would crash if options.xaxes/yaxes was undefined.

Now checks to see if options.xaxes and options.yaxes are undefined. If they are, they are set to a default value of [{}]. (An array with 1 empty object).
Merge branch '0.9-work' of github.com:klyngbaek/flot into 0.9-work