Change Yahoo License Header to Apache License Header
----------------------------------------------------
Key: GIRAPH-9
URL: https://issues.apache.org/jira/browse/GIRAPH-9
Project: Giraph
Issue Type: Task
Reporter: Hyunsik Choi
Assignee: Hyunsik Choi
Fix For: 0.1.0
All source codes contains Yahoo License Header as follows
{noformat}
Licensed to Yahoo! under one or more contributor license agreements.
...
{noformat}
These license header should be as follows
{noformat}
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.
...
{noformat}
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