Print out the environment on the command line when launching hosting

[davidfowl]

So the relevant information when booting up is:

• Port
• Environment

http://www.tugberkugurlu.com/archive/setting-ihostingenvironment-isdevelopment-as-true-in-an-asp-net-5-application

[Tratcher]

RE: #328

[muratg]

@Tratcher straightforward enough for Beta 8?

[Tratcher]

Should be. I can do it in my current WriteLine PR.