Added wk4 initial + random set generator
Added random set generator with arguments for length and min/max-value
Added set intersection, union and difference implementation
Added properties to test set union
Tested unionmethod based on properties, no issues found
Added intersection properties and tested intersectSet method.. No unexpected results
Added properties for differenceSet and tested differenceSet. No unexpected results found
Added time spent indication for Exercise 3.
Added Rel-type
Implemented trClos method
Added extra implementation for trClos, trClos'. Maps more to the R+ idea.
Added properties to test transitive closure
Added random testing for transitive closure. no unexpected results found.
Merge branch 'laurens'
Merge branch 'master' of github.com:martyn82/SST