rewrite BTree, Tree, and Path; working on BBTree
implemented BBTree reading
wrote implementation for SetType()
Bitmap and Path tests pass
btree test passes
BBTree test passes
huge performance increase in BBTree and BTree
don't zero bitmap in initializer
Merge branch 'master' into perf-rewrite

Conflicts:
	test/Makefile
	test/profile_tree.cc
implemented Tree methods for allocation
found bug with bbtree; finished tree tests
profile Alloc/Dealloc
added test to make sure BBTree time was really 50x better
time FindByShadow()
memory alignment, started work on Malloc
increase BTree::Free() performance
Malloc::WrapRegion works
Malloc Align() passes
everything passes
Merge branch 'master' into perf-rewrite