update to rebar with `git describe` smarts
update to rebar with `git describe` smarts

PerilousApricot/bigcouch,bittorrent/bigcouch,kofron/bigcouch,georgemarshall/bigcouch,andrejb/cloudant_bigcouch,kofron/bigcouch,benoitc/bigcouch,breezjw/bigcouch,Gussy/bigcouch,PerilousApricot/bigcouch,PerilousApricot/bigcouch,bittorrent/bigcouch,georgemarshall/bigcouch,linearregression/bigcouch,Asquera/bigcouch,PerilousApricot/bigcouch,PerilousApricot/bigcouch,cloudant/bigcouch,bittorrent/bigcouch,Asquera/bigcouch,Gussy/bigcouch,Asquera/bigcouch,breezjw/bigcouch,benoitc/bigcouch,breezjw/bigcouch,kofron/bigcouch,linearregression/bigcouch,andrejb/cloudant_bigcouch,Gussy/bigcouch,andrejb/cloudant_bigcouch,andrejb/cloudant_bigcouch,kofron/bigcouch,benoitc/bigcouch,Gussy/bigcouch,linearregression/bigcouch,Gussy/bigcouch,bittorrent/bigcouch,Asquera/bigcouch,Asquera/bigcouch,cloudant/bigcouch,breezjw/bigcouch,andrejb/cloudant_bigcouch,kofron/bigcouch,cloudant/bigcouch,georgemarshall/bigcouch,linearregression/bigcouch,PerilousApricot/bigcouch,Gussy/bigcouch,bittorrent/bigcouch,andrejb/cloudant_bigcouch,kofron/bigcouch,cloudant/bigcouch,cloudant/bigcouch,benoitc/bigcouch,benoitc/bigcouch,cloudant/bigcouch,georgemarshall/bigcouch,bittorrent/bigcouch,Asquera/bigcouch,benoitc/bigcouch,breezjw/bigcouch,linearregression/bigcouch,breezjw/bigcouch,andrejb/cloudant_bigcouch,georgemarshall/bigcouch,georgemarshall/bigcouch,linearregression/bigcouch,cloudant/bigcouch,linearregression/bigcouch