Feature insert precheck#49

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ridencww wants to merge 3 commits intotmpvar:masterfrom

ridencww:feature-insert-precheck

Commits on Jan 25, 2016

Incorporated set attribute changes by wtfaremyinitials and wrote unit tests for same.

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Merge branch 'feature-insert-precheck' of https://github.com/ridencww/weld into feature-insert-precheck
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Commits on Jan 27, 2016

Add insertPrecheck function and unit tests.
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