chore(sass): add a watcher for sass changes that can handle image-url

Fixes #1560.
Merge pull request #1561 from mozilla/issue-1560-sass-watch

chore(sass): add a watcher for sass changes that can handle image-url
styles(avatars): move the remove profile image button

Fixes #1493.
styles(cropper): vertical align range input and zoom buttons
styles(cropper): use a black back drop for the crop aread
chore(build): Move request and jshint-stylish to devDeps
Merge pull request #1563 from mozilla/issue-1493-remove-avatar-position

styles(avatars): move the remove profile image button
Merge pull request #1565 from vladikoff/move-devDep

chore(build): Move request and jshint-stylish to devDeps
styles(avatars): use sass variables
chore(l10n): add supported locales list to our repo
Merge pull request #1564 from mozilla/issue-1492-crop-input-align

Cropper style fixes
Merge pull request #1570 from mozilla/issue-1434-locale-list

chore(l10n): move list of supported locales to our production config