Added zsmalloc for 3.0 support
ZSMALLOC source files from Kernel 3.8
Introduce ZCACHE from Kernel 3.8
added cleancache from 3.7  and frontswap from 3.8
Adapt Cleancache & Frontswap on Kernel 3.0
Cleancache & frontswap new headers
Fix Cleancache porting
staging: Add Snappy compression library (v3)
change some lines