nccs compiles contract that won't deploy

[devhawk]

If you have multiple events with colliding DisplayName, nccs doesn't report and error or warning, but the contract can't be deployed.

Example:

public delegate void OnSomethingDelegate(ByteString data);
public delegate void OnSomethingElseDelegate(ByteString data);

[DisplayName("OnSomething")]
public static event OnSomethingDelegate Something;

// deploy fails because this DisplayName collides with the DisplayName attached Something event
[DisplayName("OnSomething")] 
public static event OnSomethingElseDelegate SomethingElse;