Merge pull request #13 from atlasapi/fix-api-key-on-topics-client

Add api key on topics request
Merge pull request #12 from atlasapi/mbst-5575-channel-config-from-atlas

Channel configuration support
Add POSTing of topics to Topic client.
Add logging on GsonTopicClient.
Merge branch 'mbst-5881-post-atlas-topics' into stage