Implement new page to select the maturity before checkout
Migrate database
merge branch 'master' into jl-new-select-maturity

Conflicts:
	app/locales/pages/projects/contributions/new.en.yml
	app/views/projects/contributions/new.html.slim
Merge pull request #633 from neighborly/jl-new-select-maturity

 Implement new page to select the maturity before checkout
Show maturities in project header
Remove references of old reward attributes
Remove explicit call to Reward#to_s in views
Send happens_at attribute in spec creating reward

It's a required attribute
Update contribution feature spec with the new view