prepare for heroku
added postinstall to package.json
added bower to dependencies to try to fix heroku postinstall error
now create note doesn't create note until save, and hides delete button
added cache-control max-age header
change view-note to use table instead of flex
change board to use table instead of flex, made top-row scroll if necessary
made it all work in firefox too
fixed wrong position sometimes when placing notes on board