finished js for child frames

still have to do the actual code, but the general gist of it is done. A
file with JS functions is now added to the page that is loaded in the
frame, and we are able to call the functions defined in this file from
the parent frame to the child frame
highlighting range in iframe works
temp
using rangy to manipulate structure from parent

instead of each child independantly.
what is done:
 capture selection in iframe
 apply css classes to selection
 serialize selection with respect to iframe root
 deserialize selection with respect to iframe root
 add needed stylesheet to iframe

next up:
 create local database for parent frame
 save create link-button to save selectins of 2 frames and link them
 restore previous saved links if page is loaded

future:
 detect when an iframe changes location
 render correct links from DB on frame's page