Added Support for Enteprise SparkPost#43

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Commits on Mar 15, 2017

updating host
irally1
committed

Commits on Mar 16, 2017

adding functionality to specify api_endpoints, metadeta, and binding information
irally1
committed

Commits on Mar 24, 2017

use proxy from config
irally1
committed

Commits on Apr 6, 2017