boost patch for boost log

* from boost [patches page](http://www.boost.org/patches/)
* [1_55_0/001-log_fix_dump_avx2.patch](http://www.boost.org/patches/1_55_0/001-log_fix_dump_avx2.patch)
Merge pull request #8 from smanders/boostpatch_log

boost patch for boost log