fix url in setup script
add missing namespace instructions in readme file for urls config
add human readable file size format function

by http://stackoverflow.com/questions/1094841/reusable-library-to-get-human-readable-version-of-file-size
pep 8 improvements for human readable file size function
add spaces between value and unit in human readable format function
add media root setting for filemanager
implement prototype of browse view with bootstrap based template
add urls config with entry for browse view
prototype breadcrumbs generation with rendering in browser template