Finished Example Assignment
Implemented parenthesis balancing - week 1
Implemented Pascal's triangle - week 1
Implemented counting change - week 1
Fixed bug on parenthesis balancing - week 1
[W2] Implemented singletonSet
[W2] Implemented set union
[W2] Implemented set intersection
[W2] Implemented set difference
[W2] Implemented set filter
[W2] Implemented set forall
[W2] Implemented set exists in terms of forall
[W2] Implemented set map