Added tests for compose method to EquaSetSpec and SortedEquaSetSpec.
Added 3 copyToArray methods.
Added copyToBuffer method to EquaSets.
Added count method to EquaSets.
Reorder methods in EquiSets to follow alphanumerical order.
Reorder info method in SortedEquaSets to allow alphanumerical order.
Added drop method to EquaSets.
Added dropRight method to EquaSets.
Added dropWhile method to EquaSets.
Fixed duplicated test name problem in SortedEquaSetSpec.
Added exists method to EquaSets.
Added filter method to EquaSets.
Added filterNot method to EquaSets.
Added find method to EquaSets.
Added fold method to EquaSets.
Added foldLeft to EquaSets.
Added foldRight to EquaSets.
Added forall method to EquaSets.
Added foreach method to EquaSets.
Added groupBy method to EquaSets.