upload.py option refactoring
upload.py option refactoring

change options of upload.py from:

1. on first submission
   -m, --message gives an issue a title
   -d, adds description to an issue
2. on issue update
   -m, --message gives title to a patchset
   -d ??? updates description ???

To:

1. on first submission
   -t, --title issue subject
   -m, --message issue description
   -F, --file <file> read description from file
2. on issue update
   -t, --title new patchset title
   -m, --message message to reviewers
   -F, --file <file> read message from file

Review URL: http://codereview.appspot.com/5476044/
Discussion: https://groups.google.com/forum/#!topic/codereview-discuss/bPyZSIfVHDY

TODO: http://code.google.com/p/rietveld/issues/detail?id=351

riannucci/rietveldv2,riannucci/rietveldv2