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 1.9.3 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 running
the storm jar as was the instructions on the git page
https://github.com/nfalaki/storm-crawler
Merge pull request #30 from nfalaki/upgradeToJackson2

Upgrade Jackson to Jackson2