Merge pull request #834 from pgburt/paulb-prod-users-integrations

Added produciton-users and integrations pages

Documentation/integrations.md

+# Integrations
+This document tracks the libraries and tools that are compatible with dex. [Join the community](https://github.com/coreos/dex/), and help us keep the list up-to-date.
+
+## Tools
+
+## Projects with a dex dependency

Documentation/production-users.md

+# Production users
+
+This document tracks people and use cases for dex in production. [Join the community](https://github.com/coreos/dex/), and help us keep the list up-to-date.
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