limit queries

limit the number of queries per ip per day, default is 3, configurable in web.xml, effective immediately (no need to restart tomcat).
files added: 
* queryexceeded.html
* SimpleQueryLimitFilter.java
files updated:
* web.xml


Would this not append the query (and possibly other information) to the key? If so, different queries from the same IP might result in the same key and thus would not be counted towards the limit.