TIMESTAMP is not in the SQLite3 specification

[tredoe]

The type "TIMESTAMP" has been added to this driver but it does not follows the SQLite3 specification (http://sqlite.org/datatype3.html):

1.2 Date and Time Datatype

SQLite does not have a storage class set aside for storing dates and/or >times. Instead, the built-in Date And Time Functions of SQLite are capable of storing dates and times as TEXT, REAL, or INTEGER values:

TEXT as ISO8601 strings ("YYYY-MM-DD HH:MM:SS.SSS").
REAL as Julian day numbers, the number of days since noon in Greenwich on November 24, 4714 B.C. according to the proleptic Gregorian calendar.
INTEGER as Unix Time, the number of seconds since 1970-01-01 00:00:00 UTC.

Applications can chose to store dates and times in any of these formats and freely convert between formats using the built-in date and time functions.

This is an important issue because the SQL code used in Go with this driver would not be valid in others drivers that have followed the specification.

[mattn]

Closed by #155