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Merge pull request #22 from cherryivy/small_fixes

Small fixes
use paperclip/aws
s3 settings
config paperclip
clear paperclip config
add cover_image to events
upload images to s3
non-persistent connection for uploads
Merge pull request #23 from cherryivy/feature/image_upload

Feature/image upload
Merge pull request #24 from cherryivy/develop

Image upload to s3