Fix skyline templates to work in latest premailer

This is a start on the issues mentioned in #2
Merge branch 'master' into premailer-fixes

* master:
  Fix unclickable Zen Flat buttons in Gmail web
fix pre mailer issues in airmail templates
fix airmail, cleave, go, narrative, neopolitan template pre-mailer issues with !important styles
fix sunday template pre-mailer issues, remove inline !importants and fix css errors
Merge pull request #9 from sendwithus/premailer-fixes

Premailer fixes