canonized several names
modified:   src/dvdtrackrip.py
correct spelling disk->disc
getDvdTrackInfo: second Argument(Tracknumber) is now optional, default is 0, returns info about all tracks
Drop support for subtitle conversion
remove shutil.which for the command dvdtrackrip uses, must be now avaible via PATH
if the Enviromentvariable $TEMP exist dvdtrackrip use this a the base working directory, otherwise the basename of the destination
removed some forgotten subtitle conversion things
cd in workspace directory is now done in dvdtrackrip(), corresponding parameter from riptrack removed
Updated dependencies in README