IRONY: `SourceSpan.ToString()` for easier debugging.
Issue #35: Rename projects "Pash.*" -> "*"
Issue #35: Update assembly & namespace names to remove "Pash."
Issue #35: Rename project directories to remove "Pash."
Issue #35: Remove "Pash." from "TestHost\Pash.System.Management"
Fix casing of "FIleSystemTests"
Remove `System.Management.cd`

I don't know anyone who finds these class diagrams useful. I prefer to
read the code.
Fix casing of directory "FIleSystemTests"

(This is the git side of cf0b1fe3135fa5d261bae863d577b2189458d621)
Merge pull request #77 from JayBazuzi/issue-35-assembly-names

Fixed #35 - assembly names shouldn't say "Pash."