Update README
Update package.json
Update travis config
Use anyfetch-provider 1.x in dropbox provider
Remove useless comments
Add setApiUrl in a test
Add email to accountName
Update dropbox error
Update package.json
Update image test
Update travis.yml with redis-server
Add concurrency on deletionWorker
Fix a bug
Upgrade version of anyfetch-provider
Merge branch 'master' into new-provider

Conflicts:
	package.json
Remove useless comment
Add Quentin to collaborators
Add a maxSize config var
Update version in package.json
Update a comment