Merge legend and poly.line bugfixes into master#43

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djvill wants to merge 7 commits intodrammock:masterfrom

Commits on Sep 11, 2016

Fixed var.col.by==group legend bug
djvill
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Commits on Sep 12, 2016

Partially fixed poly.line=TRUE & var.col.by==group bug
djvill
committed
Fixed legend.lty bug
djvill
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Fixed legend.bgf bug
djvill
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Merge pull request #1 from djvill/legend
djvill
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add script to test legend generation
drammock
committed

Commits on Sep 15, 2016

Merge pull request #2 from drammock/test-djv-fixes
djvill
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