Check if inter table references can be resolved.

Fixed #4
Use return; instead of return undef;
Change format of error statements.
Fix pod to add more description of $num argument.
Merge pull request #3 from Kesin11/develop

Update document for argument of generate() in Data::Generator::FromDDL class.
Merge branch 'develop'
Update README
Checking in changes prior to tagging of version 0.06.

Changelog diff is:

diff --git a/Changes b/Changes
index 7e28fd2..ee96837 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,11 @@ Revision history for Perl extension Data-Generator-FromDDL

 {{$NEXT}}

+0.06 2014-05-25T00:21:04Z
+
+    - Fixed bugs
+    - Updated document
+
 0.05 2014-05-21T15:24:53Z

     - Support float, double, and boolean types.