User should be able to set image URL for application #323

Remove image file upload
Add logo_url with validation for 'https' prefix
User should be able to set image URL for application #323

Extend doorkeeper application with logo_url
Remove paperclip fields from db
Add test for logo_url format validation
Feature/logo url #344

Replace domain.com with example.com
Feature/logo url #344

Remove paperclip
Update migrations to handle paperclip fields without using gem
Merge branch 'devel' of github.com:18F/myusa-server into feature/logo_url

Conflicts:
	app/controllers/applications_controller.rb
	db/schema.rb
	lib/doorkeeper_patches/concerns/application_extension.rb
Twilio config & Chef secrets
Added SMS number to production.rb
Added SMS sender to development & test envs
Merge pull request #358 from 18F/feature/twilio-config

Feature/twilio config
Merge branch 'devel' into feature/logo_url

Conflicts:
	app/views/doorkeeper/applications/_form.html.erb
Responsive spacing issues; section centering

Reduced the arrows in the steps and put them near the numbers.
This is instead of the big arrows. Centered the section with
the numbers using bootstrap columns.

Made the width of the login block constrained across different
screen resolutions, and used the bootstrap center-block option
to center it on the page.

Changes requested by @dutchashell
Merge pull request #362 from 18F/hotfix/marketing-page

Responsive spacing issues; section centering
Remove unneeded <br>
Merge pull request #344 from 18F/feature/logo_url

Feature/logo url
Remove bootstrap column classes

These shouldn't have been in the PR and were missed.  Committing
this quick fix.
Merge pull request #365 from 18F/hotfix/html-for-logo-url

Remove bootstrap column classes for logo url field
Force logout with url params

Use warden hooks to allow us to force a redirect by specifying 'logout=true' in the query params.
Added a test
Modify audit code to prevent against infinite loop

Calling current_user inside of before_logout hook can cause bad things to happen.
Merge branch 'devel' into feature/multiple-owner-ui

Conflicts:
	app/controllers/applications_controller.rb
	db/schema.rb
	spec/models/doorkeeper/application_spec.rb