Operator: ForEach

[benjchristensen]

http://msdn.microsoft.com/en-us/library/hh211815(v=vs.103).aspx

[benjchristensen]

Some information on this and other blocking operators: http://www.introtorx.com/content/v1.0.10621.0/10_LeavingTheMonad.html

[benjchristensen]

Pull request merged, will be in next release.