pgsql: Update 9.4 release notes.

Update 9.4 release notes.

Set release date, do a final pass of wordsmithing, improve some other
new-in-9.4 documentation.

Branch
------
REL9_4_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/76547289b5b351799198c8ea6fae3f0e52d576e7

Modified Files
--------------
doc/src/sgml/datatype.sgml | 15 +--
doc/src/sgml/plpgsql.sgml | 65 +++++++-----
doc/src/sgml/release-9.4.sgml | 233 +++++++++++++++++------------------------
3 files changed, 143 insertions(+), 170 deletions(-)

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