Merge pull request #248 from davidgrenier/master

Marks Strings.separatedBy as obsolete
module functions for Vector<Vector<'T>>

flatten : Vector<Vector<'T>> -> seq<'T>
nthNth : int -> int -> Vector<Vector<'T>> -> 'T
tryNthNth : int -> int -> Vector<Vector<'T>> -> 'T option
singleton : 'T -> Vector<'T>
updateNth : int -> int -> 'T -> Vector<Vector<'T>> -> Vector<Vector<'T>>
tryUpdateNth : int -> int -> 'T -> Vector<Vector<'T>>
windowSeq : int  -> seq<'T> -> Vector<Vector<'T>>
Merge pull request #250 from jackfoxy/master

module functions for Vector<Vector<'T>>
correct and refactor Vector test

readability, also one test duplicated and another missing (cut and paste
bug)
copyright date, added Jack Fox to license
Merge pull request #251 from jackfoxy/master

correct and refactor Vector test; license update
Merge pull request #253 from davidgrenier/master

Type alias, more convenient to use by only opening the FSharpx.Regex module.