Remove graylog2-rest-client git submodule
Add external graylog2-rest-client dependency
Upgrade to Play 2.3.4
Upgrade to async-http-client 1.8.14
Add sbt-less plugin

See https://www.playframework.com/documentation/2.3.4/Migration23#sbt-web for details
Rename main.less to graylog2.less because eff you, SBT!
Update Travis CI config to use Typesafe Activator
Fix StubHttpProvider
Remove 'play23' branch identifier from appVersion
Remove unneeded test dependencies
Wat‽ Fix shard_meters Scala template…

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