Add db:migrate:pending to check for pending migrations, closes #165#379

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golmansax wants to merge 2 commits intosequelize:masterfrom golmansax:master

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Commits on Oct 28, 2016

Add db:migrate:pending to check for pending migrations, closes sequelize#165
golmansax
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Commits on Oct 30, 2016

Change pending migration exit code to 3
golmansax
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