Remove scanl() scanr()
Remove pop() shift() unshift() splice() slice()
Refactor core classes
Remove span()
Implement new API
Implement lastN()
Fix flatten() on IteratorImpl
Remove isTraversable() and isArray()
Refactor
Fix FlattenIterator
Add test case for memoize()
Enumerable: Change getCollection() to value()
Improve FlattenIterator
Improve trait generator
Remove example
Rename interface class
Fix README.md
Fix typo
Merge branch 'develop'

* develop:
  Fix typo
  Fix README.md
  Rename interface class
  Remove example
  Improve trait generator
  Improve FlattenIterator
  Enumerable: Change getCollection() to value()
  Add test case for memoize()
  Fix FlattenIterator
  Refactor
  Remove isTraversable() and isArray()
  Fix flatten() on IteratorImpl
  Implement lastN()
  Implement new API
  Remove span()
  Refactor core classes