Add images to user and projects

Allow users to upload a photo of themselves and a project photo.
This commit includes: configure carrierwave, fog and aws, add
image columns to user and project tables, add image upload field to the user
and project forms, display image thumbnails in index pages, and display
 larger images on show pages. Rationalizing some of the related CSS.
Fix hound comments
respond to pull request comments
Add the ability to edit a project you created
Merge branch 'lea-edit-projects'

* lea-edit-projects:
  Add the ability to edit a project you created
  respond to pull request comments
  Fix hound comments
  Add images to user and projects

Conflicts:
	app/assets/stylesheets/custom.css.scss
	app/uploaders/image_uploader.rb
	app/views/projects/show.html.erb
	app/views/users/show.html.erb
merge