Fix dispose implementations

[SimonCropp]

So we had a bug that caused an infinite Dispose loop see #1358

This was fixed on the 4.0.2 branch as part of this commit 71aa8ae however this is still not correct. It should actually be a thread safe implementation like how Windsor does it

So tasks (on the develop branch).

• Make Dispose implementations thread safe like how Windsor does it https://github.com/castleproject/Windsor/blob/master/src/Castle.Windsor/Core/Internal/ThreadSafeFlag.cs
  https://github.com/castleproject/Windsor/blob/master/src/Castle.Windsor/MicroKernel/DefaultKernel.cs#L234
• Pull in the unit test for circular references in containers 74e7d43
• For classes that don't have unmanaged resource remove the isDisposing noise code