Metacello 1.0-beta.27.3 released

Metacello 1.0-beta.27.3 has a coupld of bugfixes:

  - fix for  Issue 90  : http://code.google.com/p/metacello/issues/detail?id=90
"includes: aglgorithm not aggressive enough"
  - fix for  Issue 92  : http://code.google.com/p/metacello/issues/detail?id=92
"Trait does not understand #isMetacelloConfig"