Added support for Jackson false ISO8601 datetime format

I want to switch from Jackson to boon, so I need this to respect backward compatibility

http://svn.codehaus.org/jackson/tags/1.9/1.9.4/src/mapper/java/org/codehaus/jackson/map/util/StdDateFormat.java
http://www.boyunjian.com/javasrc/com.fasterxml.jackson.core/jackson-databind/2.1.1/_/com/fasterxml/jackson/databind/util/StdDateFormat.java