Fixed: page-based navigation now works again

-Changed initialPageHeight/Width settings to pageHeight/Width

-Added vida-direction-control class for next/prev page buttons

-Framework for grid toggles included but non-functional

-Took off page arrows when in horizontal mode

-Added "vida-svg-wrapper" class to scroll with SVG objects

-Fixed page navigation
Fixed: only one vida-svg-wrapper exists now

Also moved scrollToPage functionality into a separate function with a scrollToCurrentPage shortcut.

Refs #8
New: scrolling updates current page number

-Added border to settings for clarity and relaphabetized

-Added pageTopOffsets array to keep track of this information; array gets populated on reload

-Added updateCurrentPage function to update current page number on scroll

-scrollToPage now uses pageTopOffsets and does not trigger above scroll event

Resolves #8