Add in relation menu with ability to delete

Relations now provide a menu with all of the actual relations in the collection
available.  Clicking on the relation will bring up the delete dialog.

Proper positioning of the menu is not included in this branch, but rough
posititioning is.

Switching to quoted keys for window.flags

Lingering environment view assigned to global; adding template.

Responding to reviews; includes drive-by of destroying view in test_environment_view.js
Merge pull request #107 from makyo/relation-menu

Relations now provide a menu with all of the actual relations in the collection
available.  Clicking on the relation will bring up the delete dialog.

Proper positioning of the menu is not included in this branch, but rough
posititioning is.
Sandbox mode local charms upload preparation.
Merge pull request #110 from frankban/local-charm-prepare-fake

Sandbox mode local charms upload preparation.

Code reorganization to introduce a fake web handler
which will simulate the local charm upload process in
sandbox mode.

QA:
1) Bootstrap juju core trunk and deploy the charm with
this branch. One way to do it is:
juju bootstrap --upload-tools
juju deploy juju-gui
juju expose juju-gui
juju set juju-gui juju-gui-source="https://github.com/frankban/juju-gui.git local-charm-prepare-fake"
Another way to do the same is:
create a release (with BRANCH_IS_GOOD=1),
manually include it in a local the gui charm,
remove the stable release already in the charm,
and then run "make deploy".

2) Open the GUI, login and deploy a local charm
(zip drag and drop to the topology).

3) Ensure everything works well and deploy the local charm.

4) Now let's do the same in sandbox mode
(juju set juju-gui sandbox=true) or just "make prod"
in the branch.

5) This time, after dropping the zip, you should see
a notification message like
"local charm upload in sandbox mode not yet implemented".

6) Done. Destroy the environment.
replace relation icon pngs with svgs.
Merge pull request #111 from garyposter/rel_svg

Trivial change: replace pngs with svgs.  As a flyby, I also removed the old lbox cruft.

To qa, go to `http://localhost:8888/:flags:/relationCollections/` , add two services, relate them, and verify that you see the new green svg icon on the relation line.
When the user drops a local charm archive on the canvas, open
a basic inspector requesting the series they would like to
deploy this charm to.
Merge pull request #112 from hatched/select-series

__To QA__
- Drag a charm archive to the canvas
- It should pop up a basic inspector asking you for the series name you would like to deploy to

__Notes__
The inspector is very ugly and is intended to have new markup and styling done in a follow-up