Adds intro text on the new templates
Updates media query to use max-width and adds deletables

It's not possible to use max-device-width since Android stock
browser does not honor pixel density in viewport. We also lower
the max-width to 480px so that the mobile version will not be
displayed on tablets.

We have also added deletables to the templates that will be supported
in MailMojo 2.4.
Merge branch 'master' into new-templates

Conflicts:
	nettbutikk-2-kolonner/index.html
Adds intro text to old templates
Small intro text tweaks and changes colors on kampanje template
Updates deletables for nyheter-3-kolonner malen