Code review comment for lp://staging/~gary/juju-gui/bug1167295

*** Submitted:

Make safe relation ids in environment view

Relation ids included spaces and other problematic chacracters in our
related DOM ids. This branch cleans those up, and also does a quick CSS
cleanup to make some text legible again.

R=jeff.pihach, matthew.scott
CC=
https://codereview.appspot.com/8640043

https://codereview.appspot.com/8640043/