Added support for datetime functions (year, month, day, hours, minutes, seconds).
Added partial support for floating timezone dateTime values in NSDate+W3CDTFSupport.m.
Fixed bug in SPARQL parser that was allowing projection of non-grouped variables in aggregate queries.
Fixed bug in SPARQL parser that was mis-parsing MINUTES() on the code path for MIN().
Fixed parsing of language tagged literals in GTWSPARQLParser tokenAsTerm:withErrors:.
Implemented support for STRBEFORE().