created sprites for light & mobile theme
added css to mobile theme
Added audio file load error message
moved demo media files into folders

there will be multiple player configurations in the demo
merged common demo css styles
created demo minisite
minor styling changes
created default-light theme

using default-dark theme as base
fixed navigation in demo site
added more media files for demo purposes
added default-dark-mobile-ui theme

designed for touchscreens
new demo playlists
cleanup
demo css changes
moved media files to demo folder
created blank demo index page
Merge pull request #3 from panmilos/styling

More default themes, new demo