Create a JPQL parser

[gregturn]

Managing custom queries inside @query annotations has become unmanageable through QueryUtils. Simply put, a collection of regular expressions does not suffice. So we instead need to craft a JPQL-compliant parser that allows us to:

• Derive count queries
• Support sortable parameters
• supports standard JPQL
• possibly support HQL (Hibernate)
• possibly support EQL (EclipseLink)

At first, it should be based upon JPA 3.1, the standard Spring Data JPA 3.1 is aligned with. If there is an agreed-upon reason to implement backwards compatibility with older versions of JPA, we can evaluate that.