added securedrop_test to setup_ubuntu.sh
added a 'New Tag' option to the dropdown and a page to enter the new tag
Merge branch 'mysql-tagging' of https://github.com/jacksingleton/securedrop into mysql-tagging

Conflicts:
	securedrop/journalist.py
	securedrop/journalist_templates/col.html
	securedrop/journalist_templates/new_tag.html