add bulk upload
add dropbox sessions controller
refactor bulk upload
add delayed job to bulk upload
fix issues with delayed job
add notifier
Move dropboxh2o to lib
add workling and starling
merge changes
add enhanced bulk upload results display
add bulk upload
add dropbox sessions controller
refactor bulk upload
add delayed job to bulk upload
fix issues with delayed job
add notifier
Move dropboxh2o to lib
add workling and starling
remove unused gems
Redmine issues: 4902, 4868, 4875, 4923, 4920, 4886, 4907, 4904, 4935.