Prepare for mergin @kookster's pull request
Merge pull request #15 from PRX/fix-clear-interval-on-finished

clear interval when different thread completes upload
changed progress UI
Merge branch 'master' of github.com:cinely/mule-uploader
changed misleading text
Update README.md
added support for extra parameters that will be sent to the backend (through extra_params)
Merge branch 'master' of github.com:cinely/mule-uploader
fixed php backend bug
Merge branch 'master' of github.com:PRX/mule-uploader