Embedded BOM breaks Apache Avro dependency

The version of the embedded BOM that's in 3.7.1 explicitly defines an apache.avro dependency with the version 1.4.0. However, Hibernate Search 4.3.0 requires a version of 1.6.3.

This means that for clients of the embedded BOM an older version of Avro is brought in for Hibernate Search. This can cause a number of problems, including the case of a webapplication deployed in EAP which because of Avro 1.4.0 will also bring in a Netty dependency which conflicts with what's already part of EAP.