Upgrade Jackson to Jackson2

I added the jackson 2.4 databind jar to the pom file of stormcrawler. I changed the JsonNode of multiple interfaces (URLFilter,ParseFilter) and there implementing classes. Also I upgraded some of the metric classes. I removed the old jackson 1.9.7 jar so this is a complete upgrade of jackson 1.9.7 to jackson 2.4.0.
I tested this by running mvn clean package to create the jar,  then I ran the storm jar. Hence I followed
the instructions on the main page https://github.com/nfalaki/storm-crawler.