[Cdash] Suggestions for experimental builds

[David Doria]

> Which ITK instructions? Those should be updated.
>
> Thanks,
> David C.

Here are some examples.

http://www.itk.org/Wiki/ITK_Procedure_for_Adding_a_Test#Submit_an_Experimental_build

http://www.itk.org/Wiki/ITK_Policy_and_Procedure_for_Adding_Dashboards#Configuring_GCOV_Coverage

http://www.itk.org/Wiki/ITK_Release_4/Wrapping/WrapITK_Installation#Experimental_build

I suggest we make a wiki page called "ExperimentalBuild" and
everywhere it has this procedure just replace it with "and make an
[ExperimentalBuild]" which links to the instructions. There is
currently a crazy amount of information non-centralization on the
wiki.

David D.