[Eva] Removes unused file in doc/value/.

doc/value/revert_preview.scpt

-  --- activate Preview
-    tell application "Preview"
-	activate
-    end tell
-    
-    --- Interface with the document
-    tell application "System Events"
-	tell process "Preview"
-	    --- Select Revert from the File menu
-	    tell menu bar 1
-		tell menu bar item "File"
-		    tell menu 1
-			click menu item "Revert"
-		    end tell
-		end tell
-	    end tell
-	    
-	    --- Restore the original page (assumes standard toolbar layout)
-	    --- Is there an easier way?
----	    tell window 1
----		keystroke tab & tab & tab & return
----		keystroke tab & tab & tab & tab using {shift down}
----	    end tell
-	end tell
-    end tell
-