Fix pod syntax
Add dynamic dbi class load interface
Update doc
minil build
Checking in changes prior to tagging of version 0.02.

Changelog diff is:

diff --git a/Changes b/Changes
index aa6569a..5b1b609 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,10 @@ Revision history for Perl extension Coteng

 {{$NEXT}}

+0.02 2013-12-29T08:13:56Z
+    - Add $DBI_CLASS
+    - Remove root_dbi_class
+
 0.01 2013-12-28T16:33:21Z

     - original version