Rake tasks should be updated to include io tests jar

[subvertallchris]

We need to make sure that when updating, a recent neo4j-io-{version}-tests.jar is in the tests folder. I just added it to 2.2.4 and released as 2.2.4.1. Without that file, Embedded tests break in Neo4j and Neo4j-core.

We might want to consider reworking the rake tasks to make this automatic. For now, I copied it from https://repo1.maven.org/maven2/org/neo4j/neo4j-io/2.2.4/.

[vpacher]

good catch, i'll add it to the task to have it automatic