Add Ruby2.0.0 build in Travis-ci, and allowed to fail
Add Ruby2.0.0 build in Travis-ci, and allowed to fail

bblimke/webmock,avantcredit/webmock,xuwupeng2000/webmock,maruware/webmock,hilben/webmock,ixti/webmock,davidbegin/webmock,hobodave/webmock,henrik/webmock,VincentZhao/webmock,spjsschl/webmock,taiki45/webmock,arronmabrey/webmock,Omnihuron/webmock,sferik/webmock,sinisterstuf/webmock,influxdb/webmock