Create LICENSE.txt

fix for issue #3
Formatting.
Styling. CSS + moved some components.
Text diplayed instead of an empty table when {directory,playlist}songs are
empty.
More consistency in class use for album / song / playlist displaying.
Also used span instead of div for this purpose.
Formatting.
Made buttons look better.
Used data-ng- instead of ng-.
Added favicon (may change?).
Better CSS for todo instructions ("select an album / a song").
Fixed #1: If not playing AND list is empty before track addition, then start
playing on addition. Otherwhile, list was probably stopped by user, so do
not restart it automatically.
Formatting + added a comment about type + removed useless variable.
Added first draft for album cover support (only .jpg and tracks have no
idea of their album cover). Fixed #7
Used stristr instead of strstr for file extension search.
(i.e. now case insensitive)
Added .ogg and .m4a extensions.
Added .png file format for album covers.
Ordering in CSS file.
Made each section scrolling independent. Fixed #10.
Added prev / next functions. Fixed #2.
Formatting.