Fix encoding when reading ASUnit's version.
Add rake task to print ASUnit's version.
Fix problems with autosaving test results.

Update AppleScriptEditorLogger to fix some errors
produced by AppleScript Editor with creating a
document for the test results ("cannot autosave,
document doesn't exist") in Mavericks.

The way I fixed this is a bit convoluted, but I
haven't found a simpler way. All the pieces seem
necessary though (make sure the file exists with
"open access", use a POSIX path for the path
property when creating the new document, explicitly
save the document, and use an alias when saving).
I have also prefixed the output lines with -- so
they appear to be comments to the editor: this
allows the user to save the test window without
getting compiler errors.