Improved media_id extraction from URL query
Improved media_id extraction from URL query

As there are many ways to get at the NASA videogallery, sometimes
there are additional query criteria and miscellaneous characters
in the URL string. Improved the pattern match to extract the media_id
if it is there.

momo-i/get-flash-videos,njtaylor/get-flash-videos,monsieurvideo/get-flash-videos,karjonas/get-flash-videos,momo-i/get-flash-videos,pcwalden/get-flash-videos,vladrich/get-flash-videos,karjonas/get-flash-videos,momo-i/get-flash-videos,vladrich/get-flash-videos,monsieurvideo/get-flash-videos,njtaylor/get-flash-videos,karjonas/get-flash-videos,pcwalden/get-flash-videos,monsieurvideo/get-flash-videos,vladrich/get-flash-videos,njtaylor/get-flash-videos,pcwalden/get-flash-videos