sbt - root project aggregate wsCoreDeps

BIG update for play 2.4.x. See CHANGES.md

v2.1.2 - see README.md

v2.1.0:

1. use HikariCP instead of BoneCP, remove AutoCleanConnection. see: playframework/playframework#2445 (comment)
2. add class play.api.Logger (in previous version, this type is just an alias to org.slf4j.Logger). object play.api.Logger is now also an LoggerLike as in the full play version - so, we can use it directly as: Logger.info(..)
3. play-jdbc config now require configs for `user` & `password` even if you use a driver previously do NOT need those configs - ex when use h2 driver.

bump v2.0.4

+ sync code with play 2.3.0-RC1.

 As a result, play-jdbc-standalone now do NOT depend on scala-io-core
+ this version is binary compatible with v2.0.2_2.2.
 So, it is compatible with both play 2.2 & play 2.3.
 So, I remove `_2.2` from version number.
+ cross compile to scala 2.10 & 2.11
+ use [sbt-sonatype](https://github.com/xerial/sbt-sonatype)

bump v2.0.2_2.2. See README.md for detail