enlarges viewport by some factor (1.5 by default) to pre-load images for lazy loading
Merge pull request #144 from IIIF/lazy-loading-preload

enlarges viewport by some factor (1.5 by default) to pre-load images for...
minimize/maximize thumbnails panel. move OSD controls and add next/previous buttons
added build directory to gitignore
add new osd controls in OpenSeadragon module. add previous/next to book view
small css fix
add icons for annotations and image choices.  some css issues
metadata icon has correct css when selected
image placeholders for manifest list page now displaying
display preview images based on space available. fixes so more icon displays correctly and doesn't display over anything else
Merge pull request #147 from IIIF/canvas-controls/icons

Canvas controls/icons
toc refactor
basic toc interaction complete with data abstracted, responding to top-level events. closes #109
merged master