ver-014 - 16.01.2014
+ zswap, frontswap, vnswap: extract and backport. ported from (https://github.com/faux123/Nexus_5/commit/33bfdf6296dfc8129fcaeed584da5b8653067abf)
+ zswap: use LZ4 if available. ported from (https://github.com/faux123/Nexus_5/commit/a3f82f48776feb0b3c246266c47ac62bdd2d327c)
+ mm/swap: fix race on swap_info reuse between swapoff and swapon. ported from (https://github.com/faux123/Nexus_5/commit/3241ad40e2a0a29756236363277c05dfac087cd2)