add is_changed
revert unnecessary changes
check value are defined
Refactor Teng::Row

Defines:
- $self->{_get_column_cached} is container of inflated values
- $self->{_dirty_columns} is container of un-updated values (will be updated by `update()`)
- $self->{row_data} is current values on database (from select query)

Issues:
- update() also called `call_deflate` method. Now, This is integrated to `set` method (only `set` method call `call_deflate`.
- set() and get() call set_column() and get_column() for expandability.
Update Document.
Fix mysql tests.
Fix POD.
Fix POD
Skip test
Use Minilla to release engineering.
Merge branch 'refactoring-teng-row'
Update Changes.
Merge branch 'master' of git://github.com/kazeburo/p5-Teng into kazeburo-master
Append test.
Update Changes
Checking in changes prior to tagging of version 0.19.

Changelog diff is:

diff --git a/Changes b/Changes
index 0328652..bc64f63 100644
--- a/Changes
+++ b/Changes
@@ -1,6 +1,8 @@
 Revision history for Perl extension Teng

 {{$NEXT}}
+
+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.
More better documentation about bulk_insert(thanks to lestrrat++)
Checking in changes prior to tagging of version 0.20.

Changelog diff is:

diff --git a/Changes b/Changes
index bc64f63..f4c9b2b 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,9 @@ Revision history for Perl extension Teng

 {{$NEXT}}

+0.20 2013-08-21T07:39:25Z
+        - Re-release for override UNAUTHORIZED flag (same as 0.19)
+
 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).
Append x_authority