client now ignores unsupported upgrades
Release 0.4.1
Merge pull request #90 from ruxkor/to_learnboost_20130117

client now ignores unsupported upgrades
fix "TypeError: Object #<Object> has no method 'global'"
Merge pull request #91 from ramitos/patch-1

fix "TypeError: Object #<Object> has no method 'global'"
Merge branch 'master' of github:LearnBoost/engine.io-client

* 'master' of github:LearnBoost/engine.io-client:
  fix "TypeError: Object #<Object> has no method 'global'"
  Release 0.4.1
  client now ignores unsupported upgrades