Pocket Edition v0.15.3 alpha

Alpha 0.15.3 was released to fix some bugs and crashes from Alpha 0.15.2.

Changes

 * Multiplayer invite screen text alignment fixed
 * Tweaks to moving blocks to make them work better & more consistently
 * Fixes to horse breeding to make it consistent with other versions
 * Tweaks to atlas generation
 * Tweaked some Realms purchase functions
 * Small tweak to mouse controls
 * Store screen layout scales better now

Fixes

 * Others
 * Players can now scroll through the list of friends in the Add Realm window using the controller.
 * Zombie pigmen now spawn with correct textures in desert biomes
 * Fixed issue with friends list being cleared on signing out
 * Pressing X on the intro page signs the user out
 * Removed phantom image of the currently equipped block when toggling a daylight sensor
 * Fixed item duplication on fences bug
 * Observer block placement fixed