Adjust the onLogin event to keep QS and hashes.

Adjust the onLogin event to keep QS and hashes.

- Fixes #1199392
- The login process wants to get you back to your original url.
- It currently only keeps the pathname part of the url and not the query
string or url hash
- This causes the onLogin to change the url and force a re-dispatch.
- This changes the process to keep everything after the hostname by building
the url from pathname + search + hash.
- There's no new tests because tests would require window.location mangling.
Please verify that you get expected behavior for the url
fullscreen/search/precise/apache2-10/?series=precise&text=apache&type=approved#bws-readme 
This breaks in jujucharms.com/comingsoon.

https://code.launchpad.net/~rharding/juju-gui/querystring-1199392/+merge/179765

(do not edit description out of merge proposal)

[rharding, 2013-08-12 18:20:56]

Please take a look.

[bac, 2013-08-12 18:35:11]

LGTM code and QA

[jeff.pihach, 2013-08-12 19:11:51]

LGTM - I would like this broken out into a method which can be mocked up to
allow us to test this code path in the future.

[rharding, 2013-08-12 19:19:58]

*** Submitted:

Adjust the onLogin event to keep QS and hashes.

- Fixes #1199392
- The login process wants to get you back to your original url.
- It currently only keeps the pathname part of the url and not the query
string or url hash
- This causes the onLogin to change the url and force a re-dispatch.
- This changes the process to keep everything after the hostname by building
the url from pathname + search + hash.
- There's no new tests because tests would require window.location mangling.
Please verify that you get expected behavior for the url
fullscreen/search/precise/apache2-10/?series=precise&text=apache&type=approved#bws-readme

This breaks in jujucharms.com/comingsoon.

R=bac, jeff.pihach
CC=
https://codereview.appspot.com/12791043