BF: Link libvw against liballreduce since uses all_reduce
Remove include_HEADERS=allreduce.h since base Makefile.am ships it already

otherwise gets installed straight under /usr/include (as well as under /usr/include/vowpalwabbit/)
added binary reduction for easy measurement of 0/1 loss
add binary files
remove spurious allreduce.h include
Merge pull request #98 from yarikoptic/master

allreduce library -- no duplicate headers, link libvw against it
support the legacy tag format but report it explicitly
Merge pull request #99 from someben/master

support the legacy tag format but report it explicitly
fixed label-related warnings
fix bug that Luis Coelho points out