Improvements in performance and functionality, first "official" release.
- New --out=filename option
- New --sleep=numberOfMilisecs
- New --headerline=free-header-line
- Changed --header semantic (now it accepts only comma-separated column names, must match --fields)
- Significant improvements in performance (row generation is processed in parallel, i/o is buffered, cache of row generating methods/objects from Faker API)