Datagen CLI v0.2 - Initial lRelease

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)

Datagen CLI v0.1 - Initial pre-release

Initial functionality