Update copyright notice from Swarming to LUCI; add AUTHORS and CONTRIBUTORS.

appengine/PRESUBMIT.py

-# Copyright 2013 The Swarming Authors. All rights reserved.
-# Use of this source code is governed by the Apache v2.0 license that can be
-# found in the LICENSE file.
-
-"""Top-level presubmit script for swarming.
-
-See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts for
-details on the presubmit API built into gcl.
-"""
-
-
-def header(input_api):
-  """Returns the expected license header regexp for this project."""
-  current_year = int(input_api.time.strftime('%Y'))
-  allowed_years = (str(s) for s in reversed(xrange(2011, current_year + 1)))
-  years_re = '(' + '|'.join(allowed_years) + ')'
-  license_header = (
-    r'.*? Copyright %(year)s The Swarming Authors\. '
-      r'All rights reserved\.\n'
-    r'.*? Use of this source code is governed by the Apache v2\.0 license '
-      r'that can be\n'
-    r'.*? found in the LICENSE file\.(?: \*/)?\n'
-  ) % {
-    'year': years_re,
-  }
-  return license_header
-
-
-def CommonChecks(input_api, output_api):
-  excluded = [
-    r'-build\.(js|html)$',
-    r'/test',
-    r'.+_pb2\.py$',
-    r'.*third_party.*',
-  ]
-  return input_api.canned_checks.PanProjectChecks(
-      input_api, output_api,
-      excluded_paths=excluded,
-      owners_check=False,
-      license_header=header(input_api))
-
-
-def CheckChangeOnUpload(input_api, output_api):
-  return CommonChecks(input_api, output_api)
-
-
-def CheckChangeOnCommit(input_api, output_api):
-  return CommonChecks(input_api, output_api)