Popup with NAL-locations on map. Fixes #1264

- Moved declartion of toshokan javascript variable to separate
  toshokan.js file to be required by those who need it.
- Added library info for the NAL locations as a javascript var.
- Removed some obsolete files.
- Changed NAL button to pop-up a modal with a Google Map showing
  the locations of- and information about the various libraries
  that have the requested material.
- Added support for google maps api key to config.