Merge pull request #40 from vkvam/master

createEntityInstance in EntityManager increments entity id's twice
Removing extra iml file.
Updated README
Fixing up the javadocs.
[maven-release-plugin] prepare release gdx-artemis-0.5
[maven-release-plugin] prepare for next development iteration
Updating README for the new version.
Removing version 0.5 since it is not yet available on maven central.
Updating README after pushing the 0.6-SNAPSHOT to sonatype snapshots.
Added tests for EntityManager