subquery support and refactor of base names.
completed first running subquery implementation.
minimal refactoring e subquery suppport imprevements.
removed features not supported by JPQL standard.
first implementation of join test.
implemented and tested joins.
Merge branch 'master' into nested-query

Conflicts:
	pom.xml
	src/main/java/org/objectquery/jpaobjectquery/JPQLQueryGenerator.java
	src/test/java/org/objectquery/jpaobjectquery/TestSimpleQuery.java
[maven-release-plugin] prepare release 1.5.0