Document the new sources API
Copy tweaks
Merge remote-tracking branch 'origin/master' into sources-api-v2

* origin/master:
  Update url paths for thread documentation
  Content tweaks to Thread-messages.md
  Copy tweaks to Threads.md
  Content tweaks and fixes for the integration guide
  Add anchors to Sources.md
  Add anchors
  Improvements to the first half of the integration doc
  More specific information on flow links
  Link to example app, refactored guide
  More happy case approach for how-to-integrate, updates to threads
  Add resource URL and post example
  First version of thread message types and threads docs
  Update links in how-to
  Activities and threads docs
  Additional info
  WIP: added flow selection and posting instructions
  Start documenting API endpoints
  Add toc + linking to how to integrate
  WIP: how to integrate docs

Conflicts:
	docs/Sources.md
Consistent new source example
Merge pull request #40 from flowdock/sources-api-v2

Document the new sources API