[Pharo-project] Monticello mirror not installing in Pharo 1.4

[Guillermo Polito]

First, it needs ObjectAsMethodWrapper, which is not any more in the 1.4
image :)

Second, ObjectAsMethodWrapper uses MethodReference, causing an infinite
recursion when installing the mirror.  I fixed this changing the
method *#on:selector:
*by

on: aClass selector: aSelector
    ^self on: (RGMethodDefinition class: aClass selector: aSelector)

Guille