dev: Inctroduced OmitAutoPropertiesCustomization.
dev: Implemented Customize.
docs: Documented OmitAutoPropertiesCustomization.
build: Installed the AutoFixture.Xunit package.
refactor: Moved ITestMethodContext from Experiment.Xunit to

Experiment.
dev: Implemented TestParametersCustomization.
docs: Documented TestParametersCustomization.
dev: Revert - Removed the constructor of TestFixture with IFixture and

ICustomization because a class implementing ITestFixtureFactory will
be introduced instead of it.
build: Addressed nuspec to specify the AutoFixture.Xunit reference.
test: Fixed a typo.
Merge pull request #45 from jwChung/new-customizations

New customizations [skip ci]