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Bug Fixes
* Fix a regression for identifiers with square bracktes
notation (issue153, by darikg).
* Add missing SQL types (issue154, issue155, issue156, by jukebox).
* Fix parsing of multi-line comments (issue172, by JacekPliszka).
* Fix parsing of escaped backslashes (issue174, by caseyching).
* Fix parsing of identifiers starting with underscore (issue175).
* Fix misinterpretation of IN keyword (issue183).
Enhancements
* Improve formatting of HAVING statements.
* Improve parsing of inline comments (issue163).
* Group comments to parent object (issue128, issue160).
* Add double precision builtin (issue169, by darikg).
* Add support for square bracket array indexing (issue170, issue176,
issue177 by darikg).
* Improve grouping of aliased elements (issue167, by darikg).
* Support comments starting with '' character (issue178).