fix selector and remove offset from section calculation now that we are using offset anchors
add animate parameter to newOceanStory for easy disabling of animation on load
enable animations
animate in-page scrolling in ocean story

maybe this should be a portal-wide setting?
experimental tweak: let the navbar scroll away on ocean story
fiddle with the navbar logo to get the proportions right.
fix anchor link bindings interfering with navbar menu
experiment: make page and section headings scroll over map
implement the rest of the ocean story overlays

lots of fiddly length units
Merge pull request #24 from point97/ocean_story_scroll_animation

animate in-page scrolling in ocean story