phpunit job + wikimedia/wikimania-scholarships

Introduces a phpunit job template '{name}-phpunit' that:
 - invokes 'phpunit' and log junit test under log/
 - publish in Jenkins the Junit result
 - archive the whole log/ dir (including junit XML)

First use for wikimedia/wikimania-scholarships. Also add phplint and
jslint to that project.

Jobs created:
    wikimedia-wikimania-scholarships-jslint
    wikimedia-wikimania-scholarships-phplint
    wikimedia-wikimania-scholarships-phpunit

bug: 57572
Change-Id: I3eb18cf43bb8aecd2c1851cb6b4019dcaf7e1027