update rebar to 2.0.0
update rebar to 2.0.0

mondemand/webmachine,riak-synrc/webmachine,basho/webmachine,Webmachine/webmachine,nparry/webmachine,zkessin/webmachine,asynchrony/webmachine,spilgames/webmachine,Webmachine/webmachine,kbrown/webmachine,boundary/webmachine,sdebnath/webmachine,alinpopa/webmachine,mkorszun/webmachine,amerisoft/webmachine,amerisoft/webmachine,mkorszun/webmachine,abanca/webmachine,agx/webmachine,campanja/webmachine,b/webmachine,raycmorgan/webmachine,rabbitmq/webmachine,desiderius/webmachine,asynchrony/webmachine,pooya/webmachine,djnym/webmachine,liuhongchao/webmachine,yfyf/webmachine,basho/webmachine,tipbit/webmachine,cmeiklejohn/webmachine,chef/webmachine,cmeiklejohn/webmachine,tigertext/webmachine,Cy6erBr4in/webmachine,tipbit/webmachine,sdebnath/webmachine,chef/webmachine,b/webmachine,lemenkov/webmachine,joedevivo/webmachine,mghardy/webmachine,rabbitmq/webmachine,choptastic/webmachine,NineFX/webmachine,tsloughter/webmachine,kellymclaughlin/webmachine,abanca/webmachine,choptastic/webmachine,mfoemmel/webmachine,kbrown/webmachine,tjarvstrand/webmachine,mghardy/webmachine,kellymclaughlin/webmachine,rabbitmq/webmachine,michaelneale/webmachine,mfoemmel/webmachine,voluntas/webmachine,vinoski/webmachine,tigertext/webmachine,riak-synrc/webmachine,mondemand/webmachine,chaslemley/webmachine,voila/webmachine,campanja/webmachine,tsloughter/webmachine,samuelrivas/webmachine,liuhongchao/webmachine,voila/webmachine,srenatus/webmachine,boundary/webmachine,raycmorgan/webmachine,i11/webmachine,agx/webmachine,michaelneale/webmachine,i11/webmachine,yfyf/webmachine,pooya/webmachine,NineFX/webmachine,samuelrivas/webmachine,neeraj9/webmachine,nparry/webmachine,voluntas/webmachine,djnym/webmachine,tjarvstrand/webmachine,neeraj9/webmachine,joedevivo/webmachine,zkessin/webmachine,alinpopa/webmachine,desiderius/webmachine,anish-mp/webmachine,lemenkov/webmachine,srenatus/webmachine,riak-synrc/webmachine,joedevivo/webmachine,spilgames/webmachine,vinoski/webmachine,chaslemley/webmachine,Cy6erBr4in/webmachine,anish-mp/webmachine