When setting up a new tree, a common annoyance is that the first page

load has to compile all the referenced static media. This may appear to

be a problem with the server loading.
To improve the initial experience, we now compile all the static media

bundles up-front through Django Pipeline. This can take some time, but

no longer than it would take if trying to load a page and doing it then.

We also show the progress as the compilations proceed, giving a sense of

how much longer the process will take.

Ran prepare-dev.py on a new tree. Saw it compile all the static media

files, and verified their presence in the htdocs/static/ directory.