[Author] Updated Fluidbox to v1.3.4

This release consist of updates to two components in Fluidbox and a minor bug fix:

**Update:** Upon popular request, I have added a new feature such that Fluidbox does not enlarge excessively images that lack the necessary resolution to fill the viewport. Also updated readme to clarify basic usage details

**Bug fix:** Fluidbox not working with elements that are hidden. Now Fluidbox *only binds to visible elements on the page*. If you are revealing images later (by user interaction, AJAX requests and the likes), please bind `.fluidbox()` to newly visible elements.