Fix Hql-Queries using CEILING and LN.

[coderesting]

The Hibernate functions ceiling and ln are currently breaking the spring-data Query validation.

Problem: CEILING and LN were defined as reserved identifiers in the hql grammar file but never used.
Solution: This Pull Request adds CEILING and LN to the List of reserved words for use as a function name or identifier.

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[mp911de]

Thanks a lot. We're generally limited towards function names that we declare while Hibernate accepts unknown function names. That requires a slightly different approach to allow these. I'll take care of this during the merge.

[mp911de]

Thank you for your contribution. That's merged, polished, and backported now.