Post-branch version bump to 1.5.1
Post-branch version bump to 1.5.1

heysion/clutter-clone,kerrickstaley/clutter-vala,collects/clutter,jigpu/clutter,nobled/clutter,jigpu/clutter,djdeath/clutter,djdeath/clutter-android,kerrickstaley/clutter-vala,Distrotech/clutter,GNOME/clutter,heysion/clutter-clone,djdeath/clutter-multithreaded,dlespiau/clutter,djdeath/clutter,GNOME/clutter,kerrickstaley/clutter-vala,spatulasnout/clutter,heysion/clutter-clone,nobled/clutter,djdeath/clutter-android,GNOME/clutter,ebassi/clutter,djdeath/clutter-multithreaded,Distrotech/clutter,jigpu/clutter,jigpu/clutter,spatulasnout/clutter,collects/clutter,ebassi/clutter,collects/clutter,djdeath/clutter-android,djdeath/clutter,djdeath/clutter-multithreaded,collects/clutter,nobled/clutter,ebassi/clutter,spatulasnout/clutter,djdeath/clutter-android,dlespiau/clutter,heysion/clutter-clone,spatulasnout/clutter,djdeath/clutter-android,ebassi/clutter,collects/clutter,Distrotech/clutter,djdeath/clutter,djdeath/clutter-multithreaded,jigpu/clutter,GNOME/clutter,Distrotech/clutter,Distrotech/clutter,jigpu/clutter,Distrotech/clutter,djdeath/clutter,djdeath/clutter,spatulasnout/clutter,heysion/clutter-clone,kerrickstaley/clutter-vala,ebassi/clutter,GNOME/clutter,dlespiau/clutter