Pulp

• consolidate unnecessary setup.py files into a single one which will live in platform/setup.py. The setup.py will be for the entire pulp.<anything> Python namespace except for three components which will continue to have their own setup.py files: pulp.common, pulp.streamer, and pulp.cli.
• reduce the number of folders at the root
• organize the repo directory structure to mirror the structure it has when its installed
• rename the top level directory to be called 'platform' instead of Pulp. This will allow for a future pip install command from source of pip install https://github.com/pulp/pulp/platform/.

# create a top level folder called platform
git mv app platform

# move the platform subpackages into the 
git mv exceptions/pulp/exception platform/pulp/exceptions
git mv plugin/pulp/plugin platform/pulp/plugin
git mv tasking/pulp/tasking platform/pulp/tasking

# delete the old dirs we no longer need
git rm -rf exceptions/
git rm -rf plugin/
git rm -rf tasking/