First 1.0 release

* version 1.0.0
* too much time and too many changes since the previous formal
release, so briefly:
* Lua scripts instead of hard-coded C tests for database
("oltp") benchmarks + ability to create custom workloads
* much better single-threaded performance
* much better scalability
* improvements and cleanups in command line syntax and options
* latency histograms in cumulative statistic reports
* report hooks to print statistics in custom formats
(CSV/JSON/XML/etc.)
* Dropped Windows support
* Dropped support for Oracle, Drizzle and libattachsql drivers