Remove EnumerableHelpers

This is no longer needed as support for .NET 2.0 is dropped
Avoid uneccassary reflection

There is no need to get all the types multiple types for each assembly
Always return exit code 0 from test scripts

Otherwise an error may occur on the build server
Merge pull request #392 from Xharze/removeEnumerableHelpers

Remove EnumerableHelpers
Merge pull request #393 from Xharze/avoidSomeReflection

Avoid uneccassary reflection
Merge pull request #394 from Xharze/ignoreTestUserErrors

Always return exit code 0 from test scripts
Merge branch 'umaster'