Add Spark to REST section
Add JeroMQ to Messaging
added RabbitMQ
Add Ebean framework to ORM section.
Add Ninja Framework to Web Frameworks section
Merge pull request #58 from MartinSeeler/library/spark

Add Spark to REST section
Update README.md

Removed Spark from Web Frameworks since it's already in REST Frameworks.
Merge pull request #59 from MartinSeeler/library/jeromq

Add JeroMQ to Messaging
Merge pull request #61 from vito16/master

Added RabbitMQ
Merge pull request #62 from tmarwen/master

Update README.md
Merge pull request #63 from tmarwen/ninja

Update README.md