Checking in changes prior to tagging of version 0.19.

Changelog diff is:

diff --git a/Changes b/Changes
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 Revision history for Perl extension Teng

 {{$NEXT}}
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+0.19 2013-07-26T07:23:44Z
         - ADD: Implemented set and get methods which always inflate/deflate values to Teng::Row.
         - ADD: Implemented is_changed method to Teng::Row, which is useful for determining to update actually (thanks kazeburo).
         - MODIFY: Refactored Teng::Row and defined behavior of some methods specifically.