Fix license header spacing and update PR template (#20)

Author: laurenyu

.github/PULL_REQUEST_TEMPLATE.md

@@ -3,4 +3,4 @@
 *Description of changes:*
 
 
-By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.
+By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

test/integration/local/test_default_model_fn.py

@@ -1,15 +1,15 @@
-#  Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+# Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 #
-#  Licensed under the Apache License, Version 2.0 (the "License").
-#  You may not use this file except in compliance with the License.
-#  A copy of the License is located at
+# Licensed under the Apache License, Version 2.0 (the "License").
+# You may not use this file except in compliance with the License.
+# A copy of the License is located at
 #
-#      http://www.apache.org/licenses/LICENSE-2.0
+#     http://www.apache.org/licenses/LICENSE-2.0
 #
-#  or in the "license" file accompanying this file. This file 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.
+# or in the "license" file accompanying this file. This file 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.
 from __future__ import absolute_import
 
 import os

test/integration/local/test_gluon_hosting.py

@@ -1,15 +1,15 @@
-#  Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+# Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 #
-#  Licensed under the Apache License, Version 2.0 (the "License").
-#  You may not use this file except in compliance with the License.
-#  A copy of the License is located at
+# Licensed under the Apache License, Version 2.0 (the "License").
+# You may not use this file except in compliance with the License.
+# A copy of the License is located at
 #
-#      http://www.apache.org/licenses/LICENSE-2.0
+#     http://www.apache.org/licenses/LICENSE-2.0
 #
-#  or in the "license" file accompanying this file. This file 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.
+# or in the "license" file accompanying this file. This file 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.
 from __future__ import absolute_import
 
 import json

test/integration/local/test_onnx.py

@@ -1,15 +1,15 @@
-#  Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+# Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 #
-#  Licensed under the Apache License, Version 2.0 (the "License").
-#  You may not use this file except in compliance with the License.
-#  A copy of the License is located at
+# Licensed under the Apache License, Version 2.0 (the "License").
+# You may not use this file except in compliance with the License.
+# A copy of the License is located at
 #
-#      http://www.apache.org/licenses/LICENSE-2.0
+#     http://www.apache.org/licenses/LICENSE-2.0
 #
-#  or in the "license" file accompanying this file. This file 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.
+# or in the "license" file accompanying this file. This file 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.
 from __future__ import absolute_import
 
 import os