donation controller
display sum of total donation on project view
donation form on project show page
donation form working on project view able to sum and diplay on show page
defined amount formatting methods in both project and donation model
added dollar sign to both amount formatting methods
Merge branch 'master' of https://github.com/batesy/crowdfunder

Conflicts:
	app/controllers/projects_controller.rb
	app/models/project.rb
	app/views/projects/show.html.erb