Revert "replace --<filetype> with --filetype=<filetype>" and other issues caused by huge pull request

[blueyed]

1. Sparkup itself only needs to know if it should use the XML or HTML dialect. Therefore the --xml and --html options make totally sense.
   The Vim invocation of sparkup needs to be fixed (issue Not working with eruby #69).
2. Also, sparkup.py does not appear to be compatible with Python3, and therefore the shebang (/usr/bin/env python2) should be kept for Linux/Unix systems (just recently introduced in 04cfd22).
   I will therefore rename sparkup.py to sparkup again, and change the symlinks.
   (You have to think about sparkup being used standalone here!)

I am quite sure to have left a comment with issue #69 or its pull request a few days ago, stating that I would fix the filetype issue (but cannot find it anymore).

I will provide a pull request in an hour or so.