Python code in webkit-perf.appspot.com uses camelCase

Python code in webkit-perf.appspot.com uses camelCase
https://bugs.webkit.org/show_bug.cgi?id=77392

Reviewed by Adam Barth.

Use PEP8 style naming conventions instead of camelCase.

* Websites/webkit-perf.appspot.com/create_handler.py:
(CreateHandler.post):
(CreateHandler._create_builder):
(CreateHandler._create_branch):
(CreateHandler._create_platform):
* Websites/webkit-perf.appspot.com/dashboard_handler.py:
(DashboardHandler.get):
* Websites/webkit-perf.appspot.com/manifest_handler.py:
(ManifestHandler.get):
* Websites/webkit-perf.appspot.com/merge_tests_handler.py:
(MergeTestsHandler.post):
* Websites/webkit-perf.appspot.com/models.py:
(create_in_transaction_with_numeric_id_holder):
(delete_model_with_numeric_id_holder):
(modelFromNumericId):
(Builder.authenticate):
(Builder.hashed_password):
(Test.cache_key):
* Websites/webkit-perf.appspot.com/report_handler.py:
(ReportHandler.post):
(ReportHandler._model_by_key_name_in_body_or_error):
(ReportHandler._integer_in_body):
(ReportHandler._timestamp_in_body):
(ReportHandler.bypass_authentication):
(ReportHandler._results_are_valid):
(ReportHandler._results_are_valid._is_float_convertible):
(ReportHandler._create_build_if_possible):
(ReportHandler._create_build_if_possible.execute):
(ReportHandler._add_test_if_needed):
(ReportHandler._add_test_if_needed.execute):
(ReportHandler):
(AdminReportHandler.bypass_authentication):
* Websites/webkit-perf.appspot.com/runs_handler.py:
(RunsHandler.get):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@106321 268f45cc-cd09-0410-ab3c-d52691b4dbfc