dropzone: add function to start all, cancel all files
dropzone: add function to start all, cancel all files

jparicka/cloudly,jparicka/cloudly,ProjectCloudly/cloudly,jparicka/cloudly,ProjectCloudly/cloudly,followyourheart/cloudly,jparicka/cloudly,followyourheart/cloudly,followyourheart/cloudly,jparicka/cloudly,followyourheart/cloudly,followyourheart/cloudly,ProjectCloudly/cloudly,ProjectCloudly/cloudly,ProjectCloudly/cloudly