Added static files from https://github.com/mkorcy/tdl_hydra_head , moved them to asset pipeline
Added route to bookreader, updated stylesheet and javascript tags to look in new asset pipline locations
For some reason the default datatype inferred by ajax has changed from text to json. It's safer to specify a default anyway, so I'm doing that.
Adding BookReader images from https://github.com/mkorcy/tdl_hydra_head , moving to asset pipeline
Updated BookReader image references to point to new asset pipeline locations