read xcode DVTPlugInCompatibilityUUID in build all xcode5 compatibility script
Add note about building for Xcode 5.

As suggested in discussion of Issue #25.
Promote UserScripts to non-experimental (at least, as these things go).
Make FindFix work, kinda sorta, in Xcode 5.

Issues (purely cosmetic as far as I can tell):

- Pressing Cmd+F with find already open puts replace widget at the
  bottom of the view (presumably the calling code uses addSubview);
- Find bar layout is a proper mess;
- Show Find Options… menu option is enabled, but does nothing.
Improve Xcode 5 find bar appearance when FindFix is active.
Fix incorrect position of replace text widget when finder mode changes.
Fix dodgy comparison - though I’m not sure it’s THAT much better now.
Remove find options menu item.
Remove some unused code.
Reinstate Xcode 4.6 compatibility.
Replace calls to undeclared selectors with calls to objc_msgSend.

Cut down on warning spam.
Add version 0 of find text auto populate.

This to fix issue #17.
Turn Auto Populate button into a menu bar option.

Hopefully it now makes a bit more sense that the option doesn’t take
effect immediately…
Fix Auto Populate option for Xcode 4.
Rename User Scripts README and remove dire warnings.

It’s proven pretty well behaved…
Convert to ARC by letting Xcode 5.1 do its thing.
Add some commented-out debug junk that I’ll no doubt need again one day.
Give the XCFixin_ScriptsHandler a reference to itself, to foil ARC.

(The object is just supposed to hang around. I assume that when it used
GC, setting it as the target of an NSMenuItem was enough.)
Add some commented-out debug stuff that will probably be needed again.
Fix override of initWithDuration. It needs to return an id.