BUG: Logbook 0.10.0 requires explicit handler

As of logbook 0.10.0, logbook no longer installs a default handler,
which means that if the application doesn't install one, log messages
disappear into the ether.

Therefore, all of our scripts with `__main__` endpoints need to push a
`logbook.StderrHandler` if they're not already pushing some other
handler.

scripts/run_algo.py

@@ -14,11 +14,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import logbook
 import sys
 
 from zipline.utils import parse_args, run_pipeline
 
 if __name__ == "__main__":
+    logbook.StderrHandler().push_application()
     parsed = parse_args(sys.argv[1:])
     run_pipeline(print_algo=True, **parsed)
     sys.exit(0)