Create Solr-version specific releases

[agazzarini]

[agazzarini]

A set of minor changes have been committed as part of the pre-release phase:

• same version numbering scheme of Apache Solr / Lucene: in this way it will be easier (for a user) to detect which is the right version to get. As consequence of that, the build artifacts follow the same naming (<artifact name>-<version>.<format>)
• runtime test resources (e.g. Solr configuration files) use the transient build folder so they have the same livecycle of the build / test phase