ENH: Implement CLI.

Add a CLI that reads in an algorithm, loads data,
run the algorithm, and output performance metrics.

The examples are adapted to the new zipline API and
analyses are split into separate files.

Also add config files that run the example
algorithms with preset settings.

setup.py

@@ -47,6 +47,7 @@ setup(
     author='Quantopian Inc.',
     author_email='opensource@quantopian.com',
     packages=find_packages(),
+    scripts=['scripts/run_algo.py'],
     long_description=LONG_DESCRIPTION,
     license='Apache 2.0',
     classifiers=[