added missing icons.
hide sms keyword for demo.
fixed #274
transition to step 4.
Merge branch 'develop-frontend' into feature/VUMIGO-264-campaign-summary

Conflicts:
	go/campaigns/templates/campaigns/wizard_1_details.html
push the key to the template.
details is also editable.
links to correct sections in breadcrumbs
filling in more gaps with the preview page.
Merge branch 'develop-frontend' into feature/VUMIGO-264-campaign-summary

Conflicts:
	go/campaigns/views.py
attaching the preview view.
making everything work.
Merge branch 'feature/VUMIGO-264-campaign-summary' into develop-frontend