Post-release version bump to 1.5.3
Post-release version bump to 1.5.3

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