fix .gitattributes (#1039)

[reedy]

• fix .gitattributes

• travis got removed

• phpunit files got changed

[elasticmachine]

Since this is a community submitted pull request, a Jenkins build has not been kicked off automatically. Can an Elastic organization member please verify the contents of this patch and then kick off a build manually?

[reedy]

Backport of https://github.com/elastic/elasticsearch-php/commit/73363bc9cd40b7b0699c033ff8da3926ff4e5845

Primarily to remove .ci folder

[ezimuel]

Thanks @reedy