changing the titles in the worksheet.
Merge pull request #109 from benoitmangili/updating_title_worksheet

changing the titles in the worksheet.
moved pdf stuff into logical directories
Merge pull request #111 from jbeast/moving_pdf

moved pdf stuff into logical directories
Made step_url in stamp required
Added new type of stamp

Added the 96 well plate to 384 well plate stamp.
You must have the copy_on_target flag set to use it.
Copies to odd columns with 2 destination wells for each
source well
Renamed some confusing methods
Merge pull request #112 from jbeast/new_stamp

New type of stamp