Merge pull request #72 from larsbutler/ghec-devenv

Dev bootstrap script: ghec_viewer (styles, etc.)

[r=nastasi-oq] [f=1221929]
Merge pull request #73 from larsbutler/isc-styles

Dev bootstrap script: isc_viewer styles

[r=nastasi-oq] [f=1223708]
Merge pull request #75 from larsbutler/fe-styles

Migration of Faulted Earth layer styling

[r=nastasi-oq] [f=1223756]
pavement:

General code cleanup (comment-out code and trailing whitespace).
pavement:

Added copyright statement, since we are making modifications.
pavement:

pep8/pyflakes cleanup
pavement:

Refactored `start` tasks such that the app/environment can be stopped/
started without syncdb errors (and without having to re-bootstrap
everything).
fabfile:

Slight refactoring of bootstrap and start functions to use modified
paver tasks... which results in cleaner environment handling and
avoids some syncdb errors when stopping/restarting the app.
README.rst:

Revised fab instructions for environment handling.
fabfile:

Made app, feature, style, and layer loading much more DRY.
gs_data/gaf_viewer:

Added features, styles, and layers.
fabfile:

Added gaf_viewer to the bootstrap script.