Merge branch 'release/0.12.0' into develop
Inc max chunk size AND Modify obsolete rebar.config settings
fix to make C's UTs passed correctly AND improve slab allocater(in progress)
Done UT/check_slabs.c
Done IT(30%)
Done IT(100%) AND Benchmarks
Add integrity test with basho_bench
Change version
Merge branch 'release/0.12.2'