[Speed] perf 1.0 released: with a stable API

Hi,

After 9 months of development, the perf API became stable with the awaited "1.0" version. The perf module has now a complete API to write, run and analyze benchmarks and a nice documentation explaining traps of benchmarking and how to avoid, or even, fix them.

http://perf.readthedocs.io/

Last days, I rewrote the documentation, hid a few more functions to prevent API changes after the 1.0 release, and I made last backward incompatible changes to fix old design issues.

I don't expect the module to be perfect. It's more a milestone to freeze the API and focus on features instead ;-)

Changes between 0.9.6 and 1.0:

Enhancements:

• stats command now displays percentiles
• hist command now also checks the benchmark stability by default
• dump command now displays raw value of calibration runs.
• Add Benchmark.percentile() method

Backward incompatible changes:

• Remove the compare command to only keep the compare_to command which is better defined
• Run warmup values must now be normalized per loop iteration.
• Remove format() and __str__() methods from Benchmark. These methods were too opiniated.
• Rename --name=NAME option to --benchmark=NAME
• Remove perf.monotonic_clock() since it wasn't monotonic on Python 2.7.
• Remove is_significant() from the public API

Other changes:

• check command now only complains if min/max is 50% smaller/larger than the mean, instead of 25%.

Note: I already updated the performance project to perf 1.0.

Victor