The `__future__` we relied on is now, where the 3 specific things are
all included [since Python 3.0](https://docs.python.org/3/library/__future__.html):
* absolute_import
* print_function
* unicode_literals
* division
These import statements are no-ops and are no longer necessary.
Adds a `create_benchmark` script that automates the following three tasks:
1. Add a new Swift file (YourTestNameHere.swift), built according to the template below, to the {{single-source}}directory.
2. Add the filename of the new Swift file to CMakeLists.txt
3. Edit main.swift. Import and register your new Swift module.
The process of adding new benchmarks is now automated and a lot less error-prone.
