Pass options after '--' to video player

All the options that are passed after ` -- ` are directly passed as
command line arguments to the video player used. Fixes #124
Merge pull request #129 from MaxGfeller/vlc-options

Pass options after '--' to video player
help docs for 129
0.20.0
Display actual player name in text

Previously it would always display "vlc".
Display alternate text if no player is selected

It is possible to just download the file and not open it in any player.
Display an alternate text in this case.
Merge pull request #130 from MaxGfeller/player-name

Display correct player name
tweak default message for #130
0.20.1