Adjust method resolution warning message

This PR is intended to improve the method resolution warning message from:

![image](https://cloud.githubusercontent.com/assets/2978182/4468315/fe0b21d2-48fb-11e4-960d-291dfe134b30.png)

to this:

![image](https://cloud.githubusercontent.com/assets/2978182/4468313/f681920c-48fb-11e4-9047-569fbb17d1e4.png)

It's by no means perfect, but IMHO is better than it previously was.

@kronz @elayabharath for UI
@junmendoza for implementation

This is to address http://adsk-oss.myjetbrains.com/youtrack/issue/MAGN-2510