Translate src/annotator and src/core to JavaScript
Rename src/annotator and src/core
Translate src/util to JavaScript
Rename src/util
Make .coffee requires explicit to satisy browserify

`browserify -t coffeify` can cope with a mixed codebase, but only if the
CoffeeScript requires are explicit.
Translate src/plugin/defaultui to JavaScript
Rename src/plugin/defaultui
Translate src/notification to JavaScript
Rename src/notification
Translate src/preamble and src/namespace to JavaScript
Rename src/namespace and src/preamble
Translate src/storage to JavaScript
Rename src/storage
Translate src/ui/widget to JavaScript
Rename src/ui/widget
Translate src/ui/editor into JavaScript
Rename src/ui/editor
Translate src/ui/filter to JavaScript
Rename src/ui/filter
Translate src/ui/viewer to JavaScript