Port FxCop rule : CA1501: Avoid excessive inheritance

[Kavignon]

Description not needed. I wanted to know if there were any analyzer/refactoring for this issue.
I haven't found any, but it might be rename with another meaning than this one and I wanted to make sure. Otherwise, it could be implemented (with a pull request afterwards)

[mkrueger]

nope we don't have that yet - but I expect that MS will port all FxCop rules anyways.

btw. we've tons of unported issues atm - would make more sense to help out there I think. However feel free to open a pull request for CA1501.

I'll take that rule anyways :) - but may get replaced by a MS implementation later.

[Kavignon]

It's actually true that I should think more about opened issues !
Just thought it would make a fine addition to NRefactory.
But yeah, I will make time for opened unresolved/To do/Not working analyzers/refactorings