license: prepend apache 2.0 license to the header of all jetcd related files.

[fanminshi]

Need to add apache 2.0 license to all jetcd related files. Do this after all pending 0.0.1 milestone prs have merged.

[lburgazzoli]

I think we can add a maven goal to do so and a related checkstyle rule to ensure the header is there.

See http://www.mojohaus.org/license-maven-plugin/examples/example-add-license.html

[lburgazzoli]

Would the header below be ok:

/**
 * Copyright © 2016 CoreOS
 *
 * 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.
 */

[fanminshi]

header looks fine with me. defer @xiang90.

[xiang90]

@lburgazzoli @fanminshi changing the copyright to jetcd authors? lgtm other than that.

[fanminshi]

@xiang90 should the date be 2017 or 2016?

[xiang90]

2017 is better

[fanminshi]

@lburgazzoli Copyright © 2016 CoreOS => Copyright 2017 The jetcd authors follows etcd header convention.

[lburgazzoli]

I'm having a small issue now that I'm unable to add an empty line between the license header and the package directive which violates one of the checkstyle rules, so I have temporary disabled checkstyle's EmptyLineSeparator module

[fanminshi]

@lburgazzoli disable EmptyLineSeparator is fine with me.

[xiang90]

closing. this is done.