Add support for displaying interfaces data.

Add support for displaying interfaces data.

- Add a handlebars helper to output objects as arrays
- update the previous branch in the configuration tab to use it
- Add output from the relations property of the charmworld0 api to the model 
- Add the rendered output to the charm view template.

https://code.launchpad.net/~rharding/juju-gui/interfaces_tab/+merge/156723

(do not edit description out of merge proposal)

[rharding, 2013-04-03 00:36:40]

Please take a look.

[j.c.sackett, 2013-04-03 14:19:42]

LGTM, thanks!

[jeff.pihach, 2013-04-03 14:48:36]

LGTM nice little improvement. I have a couple suggestions below :-)

https://codereview.appspot.com/8296043/diff/1/app/models/charm.js
File app/models/charm.js (right):

https://codereview.appspot.com/8296043/diff/1/app/models/charm.js#newcode403
app/models/charm.js:403: setter: unsetIfNoValue
I think this should be quoted.

https://codereview.appspot.com/8296043/diff/1/app/models/charm.js#newcode415
app/models/charm.js:415: *
If this is for backwards compatibility will it eventually no longer be needed?
Maybe add some documentation as to when that would be.

https://codereview.appspot.com/8296043/diff/1/app/models/charm.js#newcode442
app/models/charm.js:442: *
See node about sun-setting above

https://codereview.appspot.com/8296043/diff/1/app/models/charm.js#newcode455
app/models/charm.js:455: getter: function() {
I'd combine this getter and provides getter into one method in the class.

[rharding, 2013-04-03 15:26:28]

*** Submitted:

Add support for displaying interfaces data.

- Add a handlebars helper to output objects as arrays
- update the previous branch in the configuration tab to use it
- Add output from the relations property of the charmworld0 api to the model 
- Add the rendered output to the charm view template.

R=j.c.sackett, jeff.pihach
CC=
https://codereview.appspot.com/8296043