Add ClassName property to ASTDocument Class

[LxLeChat]

Hello Stephane, Maybe we can add a simple property to the ASTDocument class called "ClassName". Depending on the direction you are willing to take regarding #47 this could be useful, because i see that Get-CUClassConstructor, Get-CUClassMethod, Get-CUClassProperty take "classname" as theirs primary argument.

[Stephanevg]

I actually completley agree with you @LxLeChat . I just finished updating Get-CUClassMethod, and clearly see the need for it there as well.