replaced dir with get-childitem
used appropriate path when importing pester
verified failure count was 0
split test case verification into individual it's so we get all the info.
This restructuring moves tests to a directory name which matches the module
in which the cmdlet resides which should improve the discoverability of a
specific test.
For tests which are not about cmdlets in a module, new directories have been
created to make those tests easier to find as well
