Edited role mapping info to address confusion. Closes elastic/elasticsearch#302.
Edited role mapping info to address confusion. Closes elastic/elasticsearch#302.

Original commit: elastic/x-pack-elasticsearch@e8acfd9711dda38441aa5471c6cd231d347df840

coding0011/elasticsearch,gingerwizard/elasticsearch,robin13/elasticsearch,gfyoung/elasticsearch,robin13/elasticsearch,strapdata/elassandra,gfyoung/elasticsearch,nknize/elasticsearch,strapdata/elassandra,scorpionvicky/elasticsearch,scorpionvicky/elasticsearch,strapdata/elassandra,scorpionvicky/elasticsearch,gfyoung/elasticsearch,nknize/elasticsearch,gingerwizard/elasticsearch,HonzaKral/elasticsearch,coding0011/elasticsearch,gingerwizard/elasticsearch,gfyoung/elasticsearch,GlenRSmith/elasticsearch,gingerwizard/elasticsearch,GlenRSmith/elasticsearch,nknize/elasticsearch,HonzaKral/elasticsearch,GlenRSmith/elasticsearch,scorpionvicky/elasticsearch,uschindler/elasticsearch,strapdata/elassandra,scorpionvicky/elasticsearch,coding0011/elasticsearch,GlenRSmith/elasticsearch,vroyer/elassandra,HonzaKral/elasticsearch,gingerwizard/elasticsearch,vroyer/elassandra,uschindler/elasticsearch,vroyer/elassandra,gingerwizard/elasticsearch,robin13/elasticsearch,nknize/elasticsearch,uschindler/elasticsearch,coding0011/elasticsearch,uschindler/elasticsearch,nknize/elasticsearch,robin13/elasticsearch,gfyoung/elasticsearch,GlenRSmith/elasticsearch,gingerwizard/elasticsearch,strapdata/elassandra,robin13/elasticsearch,HonzaKral/elasticsearch,uschindler/elasticsearch,coding0011/elasticsearch