Add new newsletter for desktop / mobile (bug 1109250)

Fixes #843
fix package path
Border above account settings buttons
Revert "Revert "Pull marketplace-elements from bower""

This reverts commit 0e0231bfeffdf198a38db43266c43030f44ba0a6.

Conflicts:
	bower.json
rm server.html, compile dev.html with nunjucks for compressed assets (bug 1099343)

use `MKT_COMPILED=1 make serve` to serve compressed
bump commonplace to rm server.html (bug 1099343)
export in the shim for marketplace-elements
Merge branch 'account-buttons'
site banner is gone
add smooth scrolling to mobile nav; simplify mobile nav offsets (bug 1109260, bug 1059002)
Merge pull request #833 from cvan/nav-tweax-scroll

add smooth scrolling to mobile nav (bug 1109260, bug 1059002)
Add newsletter.styl.css back to dev.html
no packaging for dev-feed
Commit from Mozilla Verbatim by user sara.todaro@mozillaitalia.org.: 316 of 316 strings translated (0 fuzzy).
Commit from Mozilla Verbatim by user sara.todaro@mozillaitalia.org.: 316 of 316 strings translated (0 fuzzy).
Commit from Mozilla Verbatim by user sara.todaro@mozillaitalia.org.: 316 of 316 strings translated (0 fuzzy).
Merge branch 'master' of github.com:mozilla/fireplace
Commit from Mozilla Verbatim by user sara.todaro@mozillaitalia.org.: 316 of 316 strings translated (0 fuzzy).
Add deploy_build_id to fabfile.