Protocol 1.7: Copied Mob Metadata code from 1.2.5.
Protocol 1.7: Fixed using entities.

The mouse buttons were swapped.
Fixed code style.
cProtocol::SendWindowOpen() signature changed.

This implements #313.
MobSpawner: Added skeleton and wolf conditions.

This fixes the flood of warnings in the server console in Debug mode.
Declaring 1.7.2 compatibility.
Fixed sprinting in 1.7 protocol.

Fixes #324
Merge remote-tracking branch 'upstream/master'