generalize popovers creation in buttonManager. Fixes #166
front-end for bug report
clear popover's textareas after submit
back-end for bug report
Prevent textarea to be resized horizontally.
Merge pull request #2 from iMajestic/bugReport

textarea in popover "improved"
remove deprecated code
Merge pull request #169 from Paulloz/bugreport

Fixes #131
Should check the share by email feature too when testing this merge request.