Expose available external trigger with parameters through API

[waj]

Provide a discovery endpoint so we can query externally the list of external triggers with their parameters.

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• Imported from BitBucket: https://bitbucket.org/instedd/mbuilder/issue/194
• Originally Reported By: Nicolas di Tada
• Originally Created At: 2014-10-21 20:20:16+00:00

[waj]

Fixed Issue #194: Exposed available external triggers that uses oauth.

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• Original comment by Carolina Hadad on 2014-10-21 20:20:16+00:00

[pmallol]

Ok in version 1.2-pre1