Removes Charm extension from BrowserCharm

Removes Charm extension from BrowserCharm

In order to be able to safely remove Charm, BrowserCharm cannot extend it.
-BrowserCharm now extends Model
-BrowserCharm now supports the initialization functions that Charm does (e.g.
setting attr from the provided ID)
-BrowserCharm now has the same `load` pipeline functions (e.g. `sync`)
-Tests have been updated or added to demonstrate new support
-Drive by test cleanup--there were many tests that checked the same exact
things; I've merged these to mitigate the damage from some of the test
repetition I've had to temporarily add.

https://code.launchpad.net/~jcsackett/juju-gui/remove-charm-extension-in-browser-charm/+merge/179005

(do not edit description out of merge proposal)

[j.c.sackett, 2013-08-07 15:31:13]

Please take a look.

[rharding, 2013-08-07 16:43:48]

LGTM getting closer!

https://codereview.appspot.com/12608043/diff/1/app/models/charm.js
File app/models/charm.js (right):

https://codereview.appspot.com/12608043/diff/1/app/models/charm.js#newcode540
app/models/charm.js:540: if (data.config && data.config.options && !
data.options) {
space after the !

[matthew.scott, 2013-08-07 17:14:22]

LGTM, thanks!

[j.c.sackett, 2013-08-07 21:34:33]

*** Submitted:

Removes Charm extension from BrowserCharm

In order to be able to safely remove Charm, BrowserCharm cannot extend it.
-BrowserCharm now extends Model
-BrowserCharm now supports the initialization functions that Charm does (e.g.
setting attr from the provided ID)
-BrowserCharm now has the same `load` pipeline functions (e.g. `sync`)
-Tests have been updated or added to demonstrate new support
-Drive by test cleanup--there were many tests that checked the same exact
things; I've merged these to mitigate the damage from some of the test
repetition I've had to temporarily add.

R=rharding, matthew.scott
CC=
https://codereview.appspot.com/12608043