Bring back gnome-music.doap
Create gnome-music using sed

This makes sure that all variables will be fully expanded.
Install gnomemusic package to pyexecdir instead of pythondir

So that it will be properly installed on the correct library path in
64-bit.
Add pyexecdir to path instead of pythondir

Makes sure that we include the path for the correct architecture.
Load libgd from source dir if we are running there

Makes sure that when we run inside the source dir, the source files and
current build of libgd will be used instead of the installed ones.
Load data from source dir if we are running from there
Merge pull request #37 from kyoushuu/master

Path fixes