updating web xml to include filters
Updated service database structure
 - made execution table mode generic
- added service url and UUID for execution Ids
updated Util class
 - added UUID for service executions
 - modifed insertExecution mathod signature
udpated services to capture the baseUrl for the service being invoked
 now saving all file path information in the service execution history
fixed issue with printing confusion matrix
added DataRetrieving service class
this endpoint services all the files that have being uploaded so far while invoking the data mining services