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.
Fix float/double mixup.

(Did this work before??)
Fix various ARC issues (erm... I think?) in FindFix.
Remove CurrentLineHighlighter from the disabled plugins list.
Update README for Xcode 5.1 branch.
Change DVTKit.framework path to Absolute. Add note to README about it.

(This might fix the compile problem reported as part of #30.)
Update README due to branch rearrangement.