Remove default parameters from public API

[jamill]

[ethomson]

Background: http://haacked.com/archive/2010/08/10/versioning-issues-with-optional-arguments.aspx/

(Thanks @haacked !)

[jamill]

#779 also seems related

[haacked]

Heh, #779 is directly related. 😄

[nulltoken]

Once this is fixed, how about adding a test to MetaFixture ensuring that no parameter has a default value?

Related: https://msdn.microsoft.com/en-us/library/x0acewhc(v=vs.100).aspx

[nulltoken]

Being dealt with through #1031