Bed file generation is here!

Bed file generation is here!
 * Added a new makebed function which returns a generator rather
   than writing to outstream.
 * Updated the make_description function in makebed.py to be able
   to handle cases like '<flowcell_id> (deleted)'.
 * Added a bedfile generation view which uses the makebed generator
   function to prevent memory issues on the webserver.
 * Visit <url>/library/ for trying out the new features!