Temporarily changed Conference to ConferencePlanner.
Created basic Conference class.
Modified method visibility in Conference class.
Finished ConferenceTest class.
Minor modifications.
Removed TODO stub.
Added stubs for testing overlapping sessions.
Refactored InputParser into a utility class and put it in the utility
package.
Removed unused imports.
Changed file from testinput.txt to test.input.
Test created for FileOutputProducerUtil class.
Changed InputParser to InputParserUtil.
Extracted parsing method into the InputParserUtility class.