Remove Apache license from API client generators (#4197)

* remove php apache license

* remove apache license from C#

* remove apache license in objc code

* remove license from swift 3 code

* remove apache license from perl code

* remove license from scala code

* remove license from ts, go, android, cpp, scala

* remove license from java api client

* restore clojure petstore files

* remove license from travis file

* clean up apache-related terms in php, ruby, python mustache tempaltes

* remove license from JS API cilent

samples/client/petstore/csharp/SwaggerClient/build.sh

@@ -2,17 +2,6 @@
 #
 # Generated by: https://github.com/swagger-api/swagger-codegen.git
 #
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#      http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
 
 frameworkVersion=net45
 netfx=${frameworkVersion#net}