Moved fake manager creation and initial configuration into the proxy generator (Part I)

This is the first part of PR #372 (we split it up into 2 PRs as mentioned there).

It solves #371 partially, namely that the default behavior is available inside the c'tor call. Therefore it also solves the bug #368 (see the `when_faking_a_class_which_calls_virtual_property_members_in_constructor` test case).
VS 2013's FxCop UI just offers "Suppress in suppression file" instead of "In source" for this warning, so I assumed, that FxCop doesn't accept the attribute on the method. But: I tried to add it manually and it works => I updated the PR commit.