Fix mini profiler's redirect when redirecting to URLs w/ hash fragments.

Summary: Fixing mini profiler redirect and setting up arcconfig for mini profiler repo

Test Plan:
Login as admin
Go to /redirects
Create three redirects, pointing from...
  /r/t1 to https://sites.google.com/a/khanacademy.org/forge/for-khan-employees/email-transparency#TOC-Kickoff-email-from-the-start-of-our-email-transparency-experiment
  /r/t2 to https://sites.google.com/a/khanacademy.org/forge/for-khan-employees/email-transparency?monkey=bunkey&gorilla=donkey
  /r/t3 http://google.com
  /r/t4 http://localhost:8080/r/t3

...that was four redirects, tricked ya.

Now go to all three of those /r/t{n} URLs and verify that the URLs are always valid:
  in t1's case, there should be an mp-r-id querystring parameter inserted before the hash/fragment
  in t2's case, there should be an mp-r-id querystring parameter tacked onto the end of the URL
  in t3's case, there should be an mp-r-id querystring parameter tacked onto the end of the URL
  in t4's case, there should be an mp-r-id querystring parameter with *two* values, comma-separated, tacked onto the end of the URL.

TODO(kamens): unit test this sucker

Reviewers: alpert

Reviewed By: alpert

Differential Revision: http://phabricator.khanacademy.org/D4454