<commit_before>0.1.5
 - added `method_added` callback to superclasses to ensure the correct 
   handling of open classes
 - added caching for class lookup
0.1.4
 - added caching of created mi classes
 - changed api - `Multiple( A, B )` is now `MultipleInheritance[ A, B ]`
 - everything resides within the module now so the global namespace 
   is not poisoned anymore
0.1.3
 - added support for blocks 
0.1.2
 - added naive support for instance variables
0.1.1
 - moved Multiple to module Kernel - so it's included in the class hierarchy<commit_msg>White space<commit_after>0.1.5
 - added `method_added` callback to superclasses to ensure the correct
   handling of open classes
 - added caching for class lookup
0.1.4
 - added caching of created mi classes
 - changed api - `Multiple( A, B )` is now `MultipleInheritance[ A, B ]`
 - everything resides within the module now so the global namespace
   is not poisoned anymore
0.1.3
 - added support for blocks
0.1.2
 - added naive support for instance variables
0.1.1
 - moved Multiple to module Kernel - so it's included in the class hierarchy
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