first version of DataCollector.js
started a demo for creating a remote data plot
more work on adding remote data example
Made ajax failure message a bit more helpful
fixed a context bug
Removed dataLoaded event dispatch and listeners in favor of passing a callback to the ajax function
Fixed lots of bugs/typos. Now the callback function runs when data have been loaded with ajax
Fixed more bugs. Demo app can now plot data from DataCollector
Changed name of DataConnetor to AjaxDataConnector