Fixes for keyword argument handling#1054

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97jaz wants to merge 2 commits intojruby:masterfrom

97jaz:1049-kwargs

Commits on Sep 30, 2013

Fixes JRuby #1047 - incorrect test for whether a kw arg was provided.
97jaz
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Commits on Oct 1, 2013

Fixes #1049: incorrect arity checking for kw arguments
97jaz
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