Memory stream
Basic
Num rows calculated in parallel
Compiles, but not tested
Parallel version works on LJ
mmap, uint4 instead of int
parser optimization. still need to check correctness
gen instead of reserve
Ignores comments at beginning of file
Added TssParserMP
Updated code for TMIn
LoadSS decides to parallelize if on Linux on no Str cols
Merge branch 'mmap'

Conflicts:
	snap-core/table.h
Merge branch 'master' of github.com:snap-stanford/snapr