use Ok.chunked instead of deprecated Ok.stream
Fixed Play application path in dist start script

Set the user.dir system property (ie, the working directory) to be the
Play application directory.

Fixes:
  #1574 - Better error reporting
  #1576 - Running PID gets set in predictable location
  #1577 - Application path not set
Fix broken internal link
Fixed gzip header filtering

* Fixes #1571
* Made tests test what they said they were testing
Merge pull request #1578 from yanns/patch-1

use Ok.chunked instead of deprecated Ok.stream
Merge pull request #1581 from baloo/patch-2

Fix broken internal link
Merge pull request #1577 from jroper/dist-working-dir

Application.path points to wrong place
Merge pull request #1571 from jroper/1571-gzip-headers

gzip filter doesn't preserve existing response headers
Merge remote-tracking branch: upstream/master