Make Prettifier to support EquaSets correctly.
Changed find method in EquaSet to return Option[T].
Added scaladocs to map, flatMap, filter and foreach methods of EquaSet/SortedEquaSet.
Initial withFilter implementation in EquaSet, which returns a WithFilter object that has withFilter and foreach method.
More tests for EquaSet's withFilter.
Added map and flatMap methods to WithFilter in EquaSet.
Added scaladoc for into methods in EquaSet and SortedEquaSet.
Fixed scaladoc for repr method in EquaSet and SortedEquaSet.
Added scaladoc to isEmpty method in EquaSet and SortedEquaSet.
Added scaladoc to iterator method of EquaSet and SortedEquaSet.
Added scaladoc to size method in EquaSet and SortedEquaSet.
Changed EquaSet's isTraversableAgain to always return true, unless overriden.
Changed a `EquaSet` to an `EquaSet`, and updated transpose method scaladoc.
Added toMap to EquaSet and SortedEquaSet.
Added scaladoc for toMap method in EquaSet.
Implemented toParArray in EquaSet and SortedEquaSet via implicit conversion approach, similar to Scala collection's approach.
No longer use implicit conversion to support toParArray method in EquaSet and SortedEquaSet.
Changed stringPrefix for FastEquaSet to "EquaSet", and make EquaBox to display as "EquaBox(x)" in default Prettifier implementation.
Changed toArray in EquaSet and SortedEquaSet to return Array[T].
Changed toBuffer in EquaSet and SortedEquaSet to return Buffer[T].