Added license report task

The license report task dumps a markdown report to standard out to give
some indication of the state of licenses that Play projects are using.
initial commit
Merge pull request #1537 from jroper/license-report

Added license report task
Merge pull request #1542 from wsargent/1542-update-scalaws

[doc] More WS documentation, worked examples
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
Ignore IOExceptions in PlayDefaultUpstreamHandler
Fixed email validator patterns

Also moved form specs into the correct projects.
Merge pull request #1558 from jroper/1558-email-validator

Typo in EmailValidator pattern
Merge pull request #1587 from jroper/ioexception

Ignore IOExceptions in PlayDefaultUpstreamHandler
Documentation improvements

* Documented using running pid with /var/run
* Cleaned up production documentation to be nicely linked
* Added external link validator
* Added relative link validator
* Fixed broken external links
* Fixed problematic relative links
Upgrade to newest version of sb-tnative-packager to fix several bugs
Add more working tests and examples to ScalaWS
Fix some typos and broken links, make iteratee section clearer