Code review comment for lp:~frankban/juju-quickstart/initial-vivid-support

*** Submitted:

Use charm store API to retrieve GUI revision.

This branch includes the following small fixes
in preparation for the 1.6 release:

- bump version up to 1.6.0;
- use the charm store API to retrieve the URL
   of the last revision of the juju-gui charm;
- add initial support for vivid: the new series can now
   be selected as default bootstrap node series when
   creating/editing environments.

   Tests: `make check`.

   QA:
   - just run `.venv/bin/python juju-quickstart` as
     usual, locally and on a ec2 environment
     (it would be nice if both precise and trusty
     are used as default series in this QA); check
     that vivid can be added as a default-series
     in the environment edit view; check that
     the last Juju GUI revision is correctly retrieved.

R=martin.hilton, rog
CC=
https://codereview.appspot.com/197740043

https://codereview.appspot.com/197740043/