Checking in changes prior to tagging of version 0.03.

Changelog diff is:

diff --git a/Changes b/Changes
index 9f461fc..f0fcdbe 100644
--- a/Changes
+++ b/Changes
@@ -1,5 +1,11 @@
 Revision history for Perl extension Parse::Crontab

+0.03    Wed Feb 20 06:00:00 2013
+    - fix bug Parse::Crontab::Entity's stringify overload
+    - `has_user_field` option for system crontab
+    - output some warnings if crontab contains some risky description.
+    - `verbose` option for errors/warnings output immediately
+
 0.02    Sun Jan 6 15:00:00 2013
     - fix dist abstract
     - fix bug under perl 5.12 lower