Install Werkzeug profiler, always use envdir, re-enable main menus.

- Clean up admin profile requirements stuff
- Envdir does its thing, for unset values only, in Base settings
- Install Werkzeug app profiler, use WSGI_PROFILER_ENABLED
- Re-enable menus in base template
Profiling wrapper and docs, .gitignore added to skel, add analytics.js

- Add analytics (with Google's new "Universal" analytics...)
- Add .gitconfig to hipikat admin profile skeleton
- hipikat.wsgi.application responds to WSGI_PROFILER_ENABLED
- Short docs for producing profiles in var/profiler/README