Pocket Edition v0.12.1 alpha build 5

Alpha 0.12.1 build 5 is the fifth build released for Alpha 0.12.1.

Changes

 * Controls are smoother and more responsive.

Fixes
7 bugs fixed
 * Fixed not being able to mine and jump
 * Signs can now use all the lines
 * Signs aren't pushed off screen by the virtual keyboard anymore
 * Fixed Swap Jump and Sneak not saving
 * Clients cannot set a different difficulty than the server anymore
 * Snow layers can be replaced with any block now
 * Can now place doors on top slabs