Added test that breaks when using PeekUInt64(int maxBits).
Added test that breaks when using PeekUInt64(int maxBits).

There's a bug in this function, as well as in ReadUInt64(int maxBits),
when trying to read more than 32 bits (and the value uses more than 32
bits).

lidgren/lidgren-network-gen3,dragutux/lidgren-network-gen3,SacWebDeveloper/lidgren-network-gen3,forestrf/lidgren-network-gen3,PowerOfCode/lidgren-network-gen3,RainsSoft/lidgren-network-gen3,jbruening/lidgren-network-gen3