Decrease dependency glib >= 2.38

glib >= 2.40 is not in Fedora 20

Signed-off-by: Jiří Janoušek <janousek.jiri@gmail.com>
Fix look of header bar buttons in Fedora 20

Signed-off-by: Jiří Janoušek <janousek.jiri@gmail.com>
Fix white lines around SlideInRevealer in Unity

Signed-off-by: Jiří Janoušek <janousek.jiri@gmail.com>