WL-3006 Correctly re-package solrj for web app.

SolrJ needs commons-io 2.1 but Sakai ships commons-io in shared. To make sure we get the correct version in our project we re-package commons-io into a new package and get solrj to use that.
WL-3006 Just include our own version of commons-io

As tomcat puts the web app's class loader before the shared one, and none of commons-io should be in an API. We should be able to just include a newer version of commons-io in the web app and everything will just work.

http://tomcat.apache.org/tomcat-5.5-doc/class-loader-howto.html
WL-3006 Actually include the re-written commons-io

The commons-io wasn't getting included in the JAR which means that none of the classes would be found.
Merge pull request #5 from ox-it/WL-3006

WL-3006 Have correct dependency on commons-io