Documentation for Joda types
Documentation for convenient parsing function
Publish to Maven Central

Fixes #2971.

* Tested deploying snapshots.
* Also deployed and closed a test release, to check that validation
  passed, and it did.
Fix server benchmark test

Empty configuration was causing missing configuration exceptions.
Load the default configuration from the environment.
Merge pull request #3312 from pvlugter/fix/server-benchmark

Fix server benchmark test
Merge pull request #2971 from jroper/publish-maven-central

Publish Play to Maven Central
Merge pull request #3293 from cchantep/anorm-joda-doc

Anorm documentation for Joda types
Merge branch 'anorm-doc-convinient' of https://github.com/cchantep/playframework