Update license to Apache 2

conf/lex.go

@@ -1,4 +1,15 @@
-// Copyright 2013-2016 Apcera Inc. All rights reserved.
+// Copyright 2013-2018 The NATS Authors
+// 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.
 
 // Customized heavily from
 // https://github.com/BurntSushi/toml/blob/master/lex.go, which is based on