wsgi wrapper reorg!
support pluggable wsgi apps
utils: BlockLoader() supports loading from package
exceptions: base WbException moved to utils
more refactoring!
create 'framework' subpackage for general purpose components!
contains routing, request/response, exceptions and wsgi wrappers
update framework package for pep8
dsrules: using load_config_yaml() (pushed to utils)
to init default config
add cdx_server app!
port wsgi cdx server tests to test new app!
move base handlers to basehandlers in framework pkg
(remove werkzeug dependency)