Fix pehash in peinfo.

It was incorrectly rounding division. Fix this by importing division from
__future__.

Also, all of the slices were off. I've confirmed this now outputs correct
pehash values for 32bit binaries. 64bit binaries are still broken, but I will
be fixing that upstream next. Once accepted there I will backport to here.
Use integer division in rich signature.
Merge branch 'master' of github.com:crits/crits_services