Removes the Apache license header.

This is inconsistent with the project's actual license, which is an MIT one.

difflib.go

diff --git a/difflib.go b/difflib.go
index 3774666..de4b3c0 100644
--- a/difflib.go
+++ b/difflib.go
@@ -1,17 +1,3 @@
-// Copyright 2012 Aryan Naraghi (aryan.naraghi@gmail.com)
-//
-// 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.
-
 // Package difflib provides functionality for computing the difference
 // between two sequences of strings.
 package difflib

difflib_server/difflib_demo.go

diff --git a/difflib_server/difflib_demo.go b/difflib_server/difflib_demo.go
index 4888feb..0dbdeaa 100644
--- a/difflib_server/difflib_demo.go
+++ b/difflib_server/difflib_demo.go
@@ -1,17 +1,3 @@
-// Copyright 2012 Aryan Naraghi (aryan.naraghi@gmail.com)
-//
-// 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.
-
 // A demo for difflib. This program accepts the paths to two files and
 // launches a web server at port 8080 that serves the diff results.
 package main

difflib_test.go

diff --git a/difflib_test.go b/difflib_test.go
index d4d260f..b976c6b 100644
--- a/difflib_test.go
+++ b/difflib_test.go
@@ -1,17 +1,3 @@
-// Copyright 2012 Aryan Naraghi (aryan.naraghi@gmail.com)
-//
-// 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.
-
 package difflib
 
 import (