Fix for issue 702

The issue is created by nginx that is trying to redirect the /beaker
URI into /beaker/ since in the configuration file there's no match for
/beaker without a slash. URI rewrite will not work. The solution is to
add a second location block that matches /beaker URI and proxy passes
them.
Merge pull request #714 from twosigma/ildipo/bug-702

Fix for issue 702