Refactoring of the Python build.

The source code is moved from src/python to
src/python/src. A setup.py is added at
src/python. The build_python.sh and
run_python.sh scripts are updated to build
and run the Python tests by building a
package and installing it in the developer's
Python 2.7 virtual environment.
diff --git a/tools/run_tests/run_python.sh b/tools/run_tests/run_python.sh
index ef40602..e9a0168 100755
--- a/tools/run_tests/run_python.sh
+++ b/tools/run_tests/run_python.sh
@@ -6,6 +6,12 @@
 cd $(dirname $0)/../..
 
 root=`pwd`
-PYTHONPATH=third_party/protobuf/python python2.7_virtual_environment/bin/python2.7 -B -m unittest discover -s src/python -p '*.py'
-# TODO(nathaniel): Get this working again (requires 3.X-friendly protobuf)
+# TODO(issue 215): Properly itemize these in run_tests.py so that they can be parallelized.
+python2.7_virtual_environment/bin/python2.7 -B -m _framework.base.packets.implementations_test
+python2.7_virtual_environment/bin/python2.7 -B -m _framework.face.blocking_invocation_inline_service_test
+python2.7_virtual_environment/bin/python2.7 -B -m _framework.face.event_invocation_synchronous_event_service_test
+python2.7_virtual_environment/bin/python2.7 -B -m _framework.face.future_invocation_asynchronous_event_service_test
+python2.7_virtual_environment/bin/python2.7 -B -m _framework.foundation._later_test
+python2.7_virtual_environment/bin/python2.7 -B -m _framework.foundation._logging_pool_test
+# TODO(nathaniel): Get tests working under 3.4 (requires 3.X-friendly protobuf)
 # python3.4 -B -m unittest discover -s src/python -p '*.py'