eliminate McMethodDefinition>>= override

[dalehenrich]

see Paul's suggested solution

[dalehenrich]

clean pharo1.3 build/tests

[dalehenrich]

broken squeak4.3 build/tests

[dalehenrich]

[clean Squeak])http://travis-ci.org/#!/dalehenrich/filetree/builds/1606894) & clean pharo1.3 build/tests

[dalehenrich]

IMPOTANT NOTE:

If you already have FileTree installed in your image, you will need to revert the Monticello package (restoring the MCMethodDefinition>>= method) BEFORE or AFTER upgrading.