Add the python script to create an empty database

Just run this script to set up an empty database, useful to develop
Add logo and images used so far
Add pkgdb2 css
Add a search function to the Package object and fix the search of PackageListing
Expose in the API the search_package and search_package_listing

Fix the search_collection as well
Fix the search of package_listing with orphan=True
First work on the UI

The UI code is on its own section under the package pkgdb.ui
Theming is based on the koji theme

So far visualization is done for packages, packagers and collections
search as well as single record view
Make the runserver executable