Remove container from drake containers array when directive element i…#71

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xsegrity wants to merge 5 commits intobevacqua:masterfrom

Commits on May 10, 2016

Remove container from drake containers array when directive element is destroyed.
xsegrity
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remove model when container is removed on destroy to keep everything in sync
xsegrity
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Commits on Oct 31, 2016

Commits on Aug 18, 2017

fix outage in directive when dragula-model is not used
xsegrity
committed