Changed Excercise 7 to use conventions
Replaced EndsWith with Equals in the Conventions declaration
Changed Expiration to 60 seconds
Merge branch 'ex7' into ex7-Part2

Conflicts:
	HelloWorld/HelloWorld/EndpointConfig.cs
	HelloWorld/HelloWorldServer/EndpointConfig.cs
	HelloWorld/Messages/Messages.csproj
	HelloWorld/Messages/Request.cs