textsearch-ja - textsearch_groonga: Support timestamp and timestamptz.

Log Message:
-----------
Support timestamp and timestamptz.

Modified Files:
--------------
    textsearch_groonga:
        Makefile (r1.4 -> r1.5)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/textsearch_groonga/Makefile?r1=1.4&r2=1.5)
        groonga_types.c (r1.1 -> r1.2)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/textsearch_groonga/groonga_types.c?r1=1.1&r2=1.2)
        textsearch_groonga.c (r1.10 -> r1.11)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/textsearch_groonga/textsearch_groonga.c?r1=1.10&r2=1.11)
        textsearch_groonga.h (r1.1 -> r1.2)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/textsearch_groonga/textsearch_groonga.h?r1=1.1&r2=1.2)
        textsearch_groonga.sql.in (r1.8 -> r1.9)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/textsearch_groonga/textsearch_groonga.sql.in?r1=1.8&r2=1.9)
    textsearch_groonga/expected:
        textsearch_groonga.out (r1.10 -> r1.11)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/textsearch_groonga/expected/textsearch_groonga.out?r1=1.10&r2=1.11)
    textsearch_groonga/sql:
        textsearch_groonga.sql (r1.9 -> r1.10)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/textsearch_groonga/sql/textsearch_groonga.sql?r1=1.9&r2=1.10)