#92 [NoAutoProperties] Attibute

Sorry about the second pull request, I had some git issues when I attempted to rebase my changes after I addressed the issues raised in the original pull request https://github.com/AutoFixture/AutoFixture/pull/121

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There is now a `[NoAutoProperties]` attribute that will disable automatic property population for a specified type. 

Given the following example, second and third will have automatic property population disabled but first will have automatic property population enabled or as specified in MyAutoData. 

```c#
        [Theory, MyAutoData]
        public void OmitsAutoPropertiesOnlyForSecondParameterAndNotThird(
            Foo first,
            [NoAutoProperties]Foo second,
            Foo third)
        {
            Assert.NotEqual(0, first.AutoPropertyInt);
            Assert.NotEqual(null, first.AutoPropertString);
            Assert.Equal(0, second.AutoPropertyInt);
            Assert.Equal(null, second.AutoPropertString);
            Assert.NotEqual(0, third.AutoPropertyInt);
            Assert.NotEqual(null, third.AutoPropertString);
        }
```