Added more set functions

Added is_subset, is_superset, is_proper_subset, is_proper_superset, is_disjointset

examples/README.md

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+# Examples
+
+* deque - DEQUE collection examples
+* hashmap - HASHMAP collection examples
+* hashset - HASHSET collection examples
+* heap - HEAP collection examples
+* iterators - Examples of using the collection's iterators
+* linkedlist - LINKEDLIST collection examples
+* list - LIST collection examples
+* others - Other examples, generally more robust and using multiple collections
+* queue - QUEUE collection examples
+* stack - STACK collection examples
+* treemap - TREEMAP collection examples
+* treeset - TREESET collection examples