play

Merge branch 'lighthouse-1017-patch'

[#1017] Add a property "%test.headlessBrowser" in application.conf to choose the browser version used by htmlunit in auto-test mode.

[#1016] Add a toggle button in @tests page to choose to run selenium tests in headless browser or in current browser.

[#1007] Introduce the "forceCopy" flag for the dependencies manager

[#1009] Add play version command