Substituted all usage of commons-collections with guava collections
Fix some TODOs related to Guava
Fix PLANNER-200

- Substituted HashMap with Guava's ArrayTable in MrMachine
- Changed relevant import code in MachineReassignmentImporter
- Updated unsolved data
- Sped up calculating possible solution space in AbstractSolutionImporter
Removed Guava version from pom
Fixes formatting issues
Added the isEmptyCollection() method in ConfigUtils, replaced all occurrences
Reverted changes to the MachineReassignment example
Merge pull request #45 from oskopek/PLANNER-209

Replace commons-collections with guava