New view for displaying info about closed projects

*Created a new view and added some content to it.
*Created a function of the feature to display uploaded files in the
helpers.php
Merge pull request #160 from Useful-Innovation/create-details-view

New view for displaying info about closed projects
code clean-up

*Edit project view is now using the display_purchase_file()
Merge pull request #161 from Useful-Innovation/changes

code clean-up