Some work regarding issue #20
Fixed issue in JPQLSelectExpressionListenerImpl
Merge with origin/master
Merge origin/master

Conflicts:
	core/impl/src/main/java/com/blazebit/persistence/impl/AbstractBaseQueryBuilder.java
	core/impl/src/main/java/com/blazebit/persistence/impl/HavingAndBuilderImpl.java
	core/impl/src/main/java/com/blazebit/persistence/impl/HavingOrBuilderImpl.java
	core/impl/src/main/java/com/blazebit/persistence/impl/WhereAndBuilderImpl.java
	core/impl/src/main/java/com/blazebit/persistence/impl/WhereOrBuilderImpl.java