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Tag v1.4

Issue fabiolb#179: TCP Proxy support

Changes for 1.4rc1

* Add test for TLS TCP proxy
* Move TLSConfig creation out of the listener code and into main

Issue fabiolb#179: TCP Proxy Support

Changes for 1.4beta2

* Advertise routes with 'tcp://' URL
* Update integration test for 'tcp://' URLs
* Filter urlprefix- tags from generated route commands
* Allow demo server to register additional tags
* Update UI to show TCP and HTTP routes correctly
* Update UI to limit weights to two decimal points