Update proxy code for safe shutdown

Changelog for 0.4.3:

* Proxy has initial unit test and more can be added
* Shutdown channel and cancellation added for proper shutdown of
the proxy

Generated by Derek

Fix basic auth on gateway proxy

Changelog for 0.4.2:

• PR #7 Copy headers in both directions in proxy by @alexellis

Generated by Derek

Fix version passing

Changelog for 0.4.1:

• PR #6 Fix version passing by @alexellis

Generated by Derek

Add basic auth support

Changelog for 0.4.0:

• PR #5 Add Basic Auth to the gateway by @Waterdrips

Generated by Derek

Don't follow redirects in proxy

Changelog for 0.3.1:

Generated by Derek

Add proxy to gateway

Changelog for 0.3.0:

• PR #4 Add proxy by @alexellis

Generated by Derek

Fix issue with install command

Changelog for 0.2.9:

• PR #3 Add use of template to Install command by @Waterdrips

Generated by Derek

Update for Remove service

Changelog for 0.2.8:

Generated by Derek

Extract PrepareImage function

Changelog for 0.2.7:

Generated by Derek

Extract Service deletion code

Changelog for 0.2.6:

Generated by Derek