Add Bountysource badge to README

Because you have some open bounties, we thought you might want to display this badge in your README!
install desktop file, icons and manpage with install-linux target
update standards version, add vcs adresses
add uninstall-linux to phony
get the relative path via python instead of perl
remove python stuff from Makefile
remove "SED ?= sed" line from Makefile
standardize ifeqs
Flickr's API now only use SSL

see http://code.flickr.net/2014/04/30/flickr-api-going-ssl-only-on-june-27th-2014/
Bump extension version for extensions that were changed recently
Better DBus introspect on MPRIS
Faster/leaner introspectable
Fixing some TrackList stuff for MPRIS
Merge pull request #303 from darealshinji/sb-trunk-oldxul

install desktop file, icons and manpage with install-linux target
Merge pull request #298 from bountysource-support/patch-1

Add Bountysource badge to README
Add travis to readme, add link to license and add title on the top
messed up the URLS to travis