Flash message no longer says 'true'

This fixes #215 so that a `true` flash message is no longer displayed.
adding favicon
Redirect inbound port 80 to HTTPS

This assumes the ELB is terminating HTTPS and forwarding to port 443 as plain HTTP
Fix redirect; add HSTS
Fix mixed-content warnings over HTTPS

Added placeholder PNGs
HSTS tweak from @konklone
Merge pull request #269 from 18F/hotfix/remove-true-flash-message

Flash message no longer says 'true'
Merge pull request #280 from 18F/feature/redirect-to-https

Feature/redirect to https
Merge branch 'devel' of github.com:18F/myusa-server into feature/favicon

Conflicts:
	app/views/layouts/_layout.html.erb
Fix contact form for javascript

Also created a javascript-enabled test
Merge pull request #291 from 18F/hotfix/fix-contact-form-for-javascript

Fix contact form for javascript
Merge pull request #279 from 18F/feature/favicon

adding favicon
Merge remote-tracking branch 'origin/devel' into feature/mobile_phone_confirmation