Paperclip v4

Current functionality:
- can upload an image to resources from edit page and create resource page
- can upload an document (pdf, word, txt, ppt, excel) to resources from edit page and create resource page
- can change image and/or document
- image and document only shows up if it exists
- document type validations in place
- links open cached version of document and image from show page - faster option
- clicking on document or image takes you to full cached file in new tab

Future functionality:
- can remove images and documents from show and edit pages
- maybe use jquery uploads capability - would allow for multiple documents and 
- integrate with evernote
- remove paperclip fields from roadmaps model