add NoClassNameToStringStyle implementation of ToStringStyle

Using the example from ```ToStringBuilder```, the output would look like this:
```
[name=John Doe,age=33,smoker=false]
```
@britter Yeah, definitely! Since my changes were made almost a year ago and I've already deleted my fork in desperation, I've created a new PR just now. Here it is: https://github.com/apache/commons-lang/pull/40

Have I done right?