dev: introduced ITestFixtureFactory.
dev: introduce NotSupportedFixtureFactory.
dev: implement Create method of NotSupportedFixtureFactory.
dev: introduce TypeFixtureFactory.
dev: implement FixtureType property.
docs(XML): slightly improve XML documents.
dev: implement Create method of TypeFixtureFactory.
docs(XML): improve some documents to clarify.
refactor: rename method -> testMethod.
refactor: change the paremeter type to ITestFixtureFactory,

and delete DefaultTheoremAttribute(Func<ITestFixture>).
refactor: change the paremeter type of ConvertToTestCommand

Func<MethodInfo, ITestFixture> fixtureFactory
-> ITestFixtureFactory
refactor: change the paremeter type to ITestFixtureFactory,

and delete DefaultFirstClassTheoremAttribute(Func<ITestFixture>).
dev: implement and improve the FixtureType property,

of DefaultTheoremAttribute and DefaultFirstClassTheoremAttribute
dev: make compile success.
dev: introduce AutoFixtureFactory.
dev: implement AutoFixtureFactory.
dev: create transformation file for AutoFixtureFactory.
Merge pull request #31 from jwChung/test-fixture-factory

Address ITestFixtureFactory and its implementations