These tests *do not* fail locally, nor on the Linux test runner. They do
not fail when accessing the OS X runner under debug mode. The *only*
cause is the lack of a TTY on the OS X runner, which is a Travis CI
regression. Moreover, the formatting tests do not fail when the TTY is
removed locally.
These absolutely should be fixed at some point, but it is not worth
spending any more time on it.
- Pester source code moved to `test/Pester`, deleted `ext-src`.
- Pester tests (.ps1 files) moved to `test/powershell`
- xUnit tests (.cs files) moved to `test/csharp`
- Third-party script test moved to `test/shebang`
