rewrote Readme as markdown and added use instructions
added gitignore
print a message if no connection has been possible with the MPD server

this assuming that we have removed the assert when in lua-mpd connect().
Otherwise it emits an error and our message is superfluous
README.md -> README.mdown
updated copyright year
update copyright year
initial rewrite of mpd-info and mpd-popup.lua with only C modules