Tag webmachine to pick up newest mochiweb patch

Tag webmachine to pick up http headers patch from basho/mochiweb repo

Tag webmachine 1.9.0

Merge pull request webmachine#23 from basho/jjs-1.8.1-vsn

version 1.8.1 sync

Bumping to 1.8.0

thanks, Ben!

update vsn to 1.7.2

increment version numbers

update app version

make skeleton require webmachine 1.6