Remove dead uploadstart emitter startUpload()
Remove dead uploadstart emitter startUpload()

The loadstart even is only triggered once to indicate the progress has
begun (initialize the progress bar). Essentially, this is dead code for
two reasons:

1. It never gets emitted because initProgressBar() gets emitted first.
2. No JavaScript file in pomf core uses the non-standard uploadstart
event.

alucard0134/Pomf,alucard0134/Pomf,alucard0134/Pomf,pomf/pomf,pomf/pomf-php,ewhal/gpomf,pomf/pomf