fix changelog bug when hardcoding "latest" in file path
add ESPB
add by-device category page, see https://github.com/phetsims/tasks/issues/122
add chromebook and ipad images, see https://github.com/phetsims/tasks/issues/122
add correct alt attributes for images in ByDevicePanel
Merge branch 'master' into front-page-tweaks

Conflicts:
	src/java/edu/colorado/phet/website/StringChanges.java