admin can create video, can't upload cover, now
add image holder
admin can add new video with large and small cover
setup Fog gem and Amazon S3 for Carrierwave file uploader
add fabrication gem to production environment
fix amazon s3 region
fix db seeder
fix db seeder again
rename image file
fix db seeder
remove validate presence of small cover
extract shared example 'requier admin'
modify message of success creact new video
fix the config of Carrierwave gem
admin can add video url when create video
add feature testing of admin add a new video
update environment variable sample
Merge pull request #10 from ArthurPai/feature/week6_mod1

Feature/week6 mod1