OGM-558 Remove early access repository

  The repository is used only to downaload EAP 6.1, but the
  version downloaded is quite old and we don't need to support it.

  At the moment there is not a EAP 6.2 version on the repository,
  the only way to run the integration test is to have an
  installation somewhere.
OGM-582 Update 'Getting Started' documentation section to fit for Neo4j
OGM-573 Updating to Hibernate ORM 4.3.6.Final
OGM-573 Adding modules for ORM 4.3.6.Final and a matching HSearch module to the module ZIP
OGM-528 Using native query plan cache from ORM

* Plugging in OGM's parameter metadata interpreter
* Re-enabling start-up checking of named (native) queries
OGM-414 Parsing native NoSQL queries only once and caching result in native query plan
OGM-414 Extracting separate QueryableGridDialect interface
OGM-414 Some clean-up
OGM-414 Adding type parameter to QueryableGridDialect contract
OGM-424 Adding test for auto and manual flushing for JP-QL queries
OGM-424 Auto-flushing for native queries executed via classic API

* Also adding test for executing native query via JPA
OGM-424 Adding note on flush modes to MongoDB chapter in reference guide
OGM-369 Re-enabling test
OGM-574 Extracting dependency management information into separate BOM POM
OGM-574 Updating "Getting started" guide
OGM-574 Removing some unnecessary dependencies
OGM-574 Consistently using JTA 1.2
OGM-574 Updating some dependencies
OGM-574 Moving JTA dependency to BOM as it's referenced in the "Getting started" example
OGM-575 Don't expose mutator method on AssociationContext