initial changes to make nunit-retry work with test suites
added support for [TestCase] with parameters

So far Retry does not work for TestCase when put on Fixture level
When applied to individual tests works fine
With Retry, a single test will lose its Category but not TestCase
Added final changes to nunit-retry

The retry attribute will not work on Fixture level for TestCase(). All other scenario works
Added back fixture test to demonstrate the Fixture level "Retry" works. Only for [Test] though.

Minor changes to variable initialization
Changed some test name
Merge pull request #3 from GavinWu/retry-With-testsuite

Retry with testsuite