Added support for GNUInstallDirs
Now installs the autostart file in ${XDG_CONFIG_HOME}/autostart when the code is being installed in the $HOME directory
Changes to support Gedit 3.12 in Ubuntu

Fixed bug when a binary is not automatic
Added VAPI file for gedit
Changes to finally support compilation under GEDIT 3.12 and previous
Now doesn't remove *_check_packages of different types when they are manually added
Now adds all the conditionals checks
Updated everything to Vala 0.24 because it needs new versions of the VAPI files
Updated README.md