[DEVEXP 391] Add generic webhook to trigger builds manually
Add grant approval, scope.Add, tests
bump(github.com/openshift/source-to-image) add9ff4973d949b4c82fb6a217e6919bb6e6be23
Merge pull request #343 from jcantrill/391_generic_web_hook

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Merge pull request #334 from liggitt/oauth_grant

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Merge pull request #369 from csrwng/bump_sti_add9ff4973

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