This makes it easy to override where the plugin should be installed. This is based on what totem does. https://bugzilla.gnome.org/show_bug.cgi?id=659123
* fix installation folder * include headers files * add Makefile to AC_CONFIG_FILES
This is a direct import from http://github.com/magcius/sweettooth-plugin . All the source code is the same, as it had no branding. Everything else is just renaming and modifying the "build system" to work with gnome-shell's existing one. https://bugzilla.gnome.org/show_bug.cgi?id=658070