Add --search option for tags command.
Add --search option for tags command.

Currently does a basic term in tag and re.match.

lotabout/plugins,s2hc-johan/plugins,pluser/nikola_plugins,lotabout/plugins,pluser/nikola_plugins,getnikola/plugins,getnikola/plugins,lotabout/plugins,s2hc-johan/plugins,getnikola/plugins,pluser/nikola_plugins,s2hc-johan/plugins