Try to make Jeff happy

Make use of a nonce for setting SVG-Edit IDs
option. By default, SVG-Edit behaves as before.
Calling svgCanvas.randomizeIds(true) gives our
behaviour, instead.

Also, sync with latest SVG-Edit (but disable,
for now, manual editing of IDs).

app/controllers/application_controller.rb

@@ -270,10 +270,10 @@ end
 module Instiki
   module VERSION #:nodoc:
     MAJOR = 0
-    MINOR = 18
-    TINY  = 1 
+    MINOR = 19
+    TINY  = 0 
     SUFFIX = '(MML+)'
-    PRERELEASE =  false
+    PRERELEASE =  'pre'
     if PRERELEASE
        STRING = [MAJOR, MINOR].join('.') + PRERELEASE + SUFFIX
     else