update docs and tests for cpanfile support

 * Catalyst.pm
   * mention cpanfile as a way of detecting -Home

 * t/aggregate/unit_utils_home.t
   * update expected dist_indicator_file_list count

 * t/author/spelling.t
   * add cpanfile to stopwords
fix broken tests for new psgi logging code

 * lib/Catalyst/Log.pm
   * document clear_psgi for podcoverage.t
   * add psgienv to stopwords for spelling.t

 * t/lib/TestApp/View/Dump.pm
   * clear_psgienv() is now called clear_psgi()
appease t/author/spelling.t

 * README.pod: maillist => mailing list

 * lib/Catalyst/DispatchType/Chained: ie => i.e.