Respect default value#16

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burnpanck wants to merge 3 commits intoastrofrog:masterfrom

burnpanck:respect-default-value

Commits on Jun 16, 2016

fixes #14, and added regression test
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implemented default_value using standard traitlets machinery, deprecated default keyword argument
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Commits on Jun 18, 2016

Merge branch 'master' into respect-default-value
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