Refactored Wallpost new form

- added tabs
- added right logic
Merge remote-tracking branch 'origin/refactor/detail-page' into detail-page/wallpost-new

Conflicts:
	bluebottle/common/static/refactor-sass/_variables.scss
	bluebottle/wallposts/templates/wallposts/base.hbs
Merge pull request #1188 from onepercentclub/detail-page/wallpost-new

Refactored Wallpost new form