Pgrok

- IMPROVEMENT: The pgrok web ui can now be disabled with -webport=-1

- BUGFIX: Fixed a bug where pgrok would not stop its autoupdate loop even after it should stop

- BUGFIX: Fixed a bug where pgrok's would loop infinitely trying to checking for updates after the second update check
- BUGFIX: Fixed a race condition in pgrokd's metrics logging immediately after start up

- BUGFIX: Fixed a bug where pgrok would compare the Host header for virtual hosting using case-sensitive comparisons
- BUGFIX: Fixed a bug where pgrok would not include the port number in the virtual host when not serving on port 80
- BUGFIX: Fixed a bug where pgrok would crash when trying to replay a request
- IMPROVEMENT: pgrok can now indicate manual updates again
- IMPROVEMENT: pgrok can now supports update channels
- IMPROVEMENT: pgrok can now detect some updates that will fail before downloading

- BUGFIX: Fixed an issue where pgrok's registry cache would return a URL from a different protocol

- BUGFIX: Fixed an issue where pgrok would crash when parsing bad XML that wasn't a syntax error
- BUGFIX: Fixed an issue where pgrok would crash when parsing bad JSON that wasn't a syntax error
- BUGFIX: Fixed an issue where the web ui would sometimes not update the request body when changing requests
- BUGFIX: Fixed an issue where pgrokd's registry cache would not load from file
- BUGFIX: Fixed an issue where pgrokd's registry cache would not save to file
- BUGFIX: Fixed an issue where pgrok would refuse requests with an Authorization header if no HTTP auth was specified.
- BUGFIX: Fixed a bug where pgrok would fail to cross-compile in you hadn't compiled natively first
- IMPROVEMENT: pgrok's registry cache now handles and attempts to restore TCP URLs
- IMPROVEMENT: Added simple Travis CI integration to make sure pgrok compiles