[chartbeat] Pull Request #9: Added framework for URL-change condition for virtualPage call

[SegmentDestinationsBot]

Migrated from #9 by @noah-berman

Created new option value for trackGalleryClicksAsPageviews, which should be added a toggle in the Segment UI. This creates an additional condition that only calls pSUPERFLY when the user has selected this toggle or if there has been an event that turned urlChanged to true.

TO-DO:

• hook up urlChanged to an actual URL change event within segment architecture
• set up a new toggle in the UI that connects to trackGalleryClicksAsPageviews