Js.chai

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* codex version
* docs
* docs cleanup

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* node 0.4.x compat

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* Merge branch 'feature/03x'
* browser build
* remove html/json/headers testign
* regex error.message testing
* tests for using plugins
* Merge pull request 11 from domenic/master
* Make `chai.use` a no-op if the function has already been used.

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* added in past tense switch for `been`

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* try that again

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* added `been` (past of `be`) alias