Several new features and updates

• Fix extras_require tag to install the optional dependencies
• Add development docs

• Removed benchmark_random_list and benchmark_random_array in
  favor of the static methods use_random_lists_as_arguments and
  use_random_arrays_as_arguments on BenchmarkBuilder.

• Added BenchmarkBuilder class that provides a decorator-based
  construction of a benchmark.

• Added a title to the plot created by the plot functions of
  BenchmarkResult that displays some information about the
  Python installation and environment.

Restructured benchmark and added documentation