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/generate_new_sample_saved_state.py

@@ -14,6 +14,7 @@
 # limitations under the License.
 
 import datetime
+import logbook
 import os
 import pickle
 import pytz
@@ -136,6 +137,7 @@ def generate_object_state(cls, initargs):
 
 
 if __name__ == "__main__":
+    logbook.StderrHandler().push_application()
 
     for args in argument_list:
         generate_object_state(*args)

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)