Fixes bad sbtjar
Fixes bad sbtjar

Corrects download location of the sbt jar.

Closes #490

chang2394/zipkin,rjbhewei/zipkin,hydro2k/zipkin,mzagar/zipkin,jfeltesse-mdsol/zipkin,yshaojie/zipkin,thelastpickle/zipkin,gneokleo/zipkin,fengshao0907/zipkin,xujianhai/zipkin,rocwzp/zipkin,Yelp/zipkin,xujianhai/zipkin,chang2394/zipkin,jamescway/zipkin,dsyer/zipkin,yshaojie/zipkin,Flipkart/zipkin,jfeltesse-mdsol/zipkin,dsyer/zipkin,coursera/zipkin,betable/zipkin,chang2394/zipkin,dsyer/zipkin,Yelp/zipkin,Flipkart/zipkin,wuqiangxjtu/zipkin,c3p0hz/zipkin,Yelp/zipkin,dsyer/zipkin,mzagar/zipkin,srijs/zipkin,zhoffice/zipkin,zhoffice/zipkin,jstanier/zipkin,gneokleo/zipkin,Flipkart/zipkin,betable/zipkin,mzagar/zipkin,jstanier/zipkin,lqjack/zipkin,srijs/zipkin,hydro2k/zipkin,rocwzp/zipkin,jamescway/zipkin,rjbhewei/zipkin,coursera/zipkin,prat0318/zipkin,rocwzp/zipkin,thelastpickle/zipkin,lqjack/zipkin,lqjack/zipkin,zhoffice/zipkin,c3p0hz/zipkin,jstanier/zipkin,mt0803/zipkin,mt0803/zipkin,jamescway/zipkin,chang2394/zipkin,srijs/zipkin,jstanier/zipkin,prat0318/zipkin,wuqiangxjtu/zipkin,gneokleo/zipkin,mt0803/zipkin,c3p0hz/zipkin,xujianhai/zipkin,fengshao0907/zipkin,wuqiangxjtu/zipkin,mzagar/zipkin,fengshao0907/zipkin,Flipkart/zipkin,dsyer/zipkin,c3p0hz/zipkin,gneokleo/zipkin,jfeltesse-mdsol/zipkin,dsyer/zipkin,thelastpickle/zipkin,coursera/zipkin,betable/zipkin,betable/zipkin,coursera/zipkin,fengshao0907/zipkin,Yelp/zipkin,prat0318/zipkin,rjbhewei/zipkin,hydro2k/zipkin,wuqiangxjtu/zipkin,rocwzp/zipkin,rjbhewei/zipkin,srijs/zipkin,xujianhai/zipkin,lqjack/zipkin,jamescway/zipkin,yshaojie/zipkin,mt0803/zipkin,prat0318/zipkin,yshaojie/zipkin,jfeltesse-mdsol/zipkin,thelastpickle/zipkin,hydro2k/zipkin,zhoffice/zipkin