build examples on Travis
build examples on Travis

rust-gnome/gtk,daa84/gtk,gkoz/gtk-rs-cairo,gkoz/rust-gnome-glib,LordSentox/gtk,mitaa/gtk,gkoz/rust-gnome-gtk,daa84/gtk,gkoz/rust-gnome-cairo,rust-gnome/glib,insanebits/gtk,EPashkin/rust-gnome-gtk,gkoz/gtk-rs-gtk,gkoz/rust-gnome-gtk,gkoz/gtk-rs-glib,gkoz/gtk-rs-pango,gkoz/gtk-rs-gtk,nicokoch/glib,Susurrus/gtk,drewet/gtk,rust-gnome/cairo,rtsuk/cairo,LordSentox/gtk,EPashkin/rust-gnome-glib,EPashkin/rust-gnome-gtk,mitaa/gtk,drewet/gtk,Susurrus/gtk,Susurrus/glib,insanebits/gtk,rust-gnome/gtk