use the same license header but for("LGPLv3 or later") and header as checkstyle project

[romani]

request to allow was sent to original authors - Sonar.
https://groups.google.com/forum/#!topic/sonarqube/rQxboJy0nY0

expected header of all files should be: https://github.com/checkstyle/checkstyle/blob/master/config/java.header
Should be enforced for all files by checkstyle validation.

[rnveach]

Header was applied in #73

[romani]

Sonar team want to keep LGPLv3
https://groups.google.com/forum/?utm_medium=email&utm_source=footer#!msg/sonarqube/rQxboJy0nY0/6hbFcTrPDQAJ

On 9 January 2017 at 12:57, Olivier Gaudin <[email protected]> wrote:
Hi Roman,

The LGPL v3 was chosen on purpose for the SonarQube project to offer maximum protection to the community while being business friendly. If there is a specific reason to change I am happy to consider it but otherwise I would tend to push back on this. 

Thanks

Olivier


On Sat, Jan 7, 2017 at 7:04 PM Roman Ivanov <[email protected]> wrote:
Hi Sonar team,

During checkstyle plugin transition from Sonarqube to Checkstyle organization
https://groups.google.com/forum/#!topic/sonarqube/HXXxOWS_sOs/discussion

we did not noticed that whole code is under "LGPLv3 or (at your option) any later version"
Example: https://github.com/checkstyle/sonar-checkstyle/blob/master/checkstyle-sonar-plugin/src/main/java/org/sonar/plugins/checkstyle/CheckstyleAuditListener.java

Please confirm that it is ok to convert this code to "LGPLv2.1 or (at your option) any later version"
Header will be: https://github.com/checkstyle/checkstyle/blob/master/config/java.header

https://www.gnu.org/licenses/gpl-faq.html#AllCompatibility
https://www.quora.com/What-are-the-major-differences-between-GNU-LGPL-v3-and-v2-1

So change is very cosmetic, we just allow to allow to use it from earlier version (v2.1).
I am not a lawyer, so I just want to be consistent with with checkstyle's license and give more freedom for user, as they could choose any version they want from v2.1 to any later version.

Please confirm that you are ok with re-licensing.
Or let me know if there is problem with this. 

thanks,
Roman Ivanov
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[rnveach]

@romani anything left to do here?