Merge pull request #8 from jcerise/master

Added visible topics, fixed AJAX issue when adding topics
Changed to use PostgresSQL (you must install on your development machine).
Assorted notes file.
Minor formatting
Trying to switch to floatThead for sticky table headers (not working yet)
Added floatthead scripts to asset pipeline, they now load correctly, removed inline JS from  bottom of board.html and moved it to board.js. SFloatThead still not working, not sure why, its like it just doesnt find the table header...