fixes fragile tests broken in GNU Smalltalk 3.2.90
fixes file permissions
mentions building HEAD version of GNU Smalltalk via homebrew
fixes #4
redirect stdout only to /dev/null
Revert "fixes #4"

This reverts commit b048330d736571ed92da2d00d8c7f69087dc808e.
improved OrderedCollection and SortedCollection koans
Added one example to TestAssociation.st that demonstrates that any object could be the key in association
changed Klass to the Object in TestAssociation koan
Merge pull request #6 from german/an_object_as_assoc_key

Added one example to TestAssociation.st
adds @german to contributors list
fixes #7, uses Set instead Array
removes wishful thinking