Add build status badge to readme
Add build status badge to readme

This reports our Travis CI build status.

Change-Id: I383a43c821e02c35a547a6caec9bb4af1739d967
Reviewed-on: http://gerrit.causes.com/37030
Tested-by: Joe Lencioni <1dd72cf724deaab5db236f616560fc7067b734e1@causes.com>
Reviewed-by: Joe Lencioni <1dd72cf724deaab5db236f616560fc7067b734e1@causes.com>

500friends/db-query-matchers