merge in of systemd-crontab-generator
fixes to man pages, path of generator
merge of 2 README.md
add support for VISUAL as stated in help text
make crontab-generator follow configure rule to make it able to run with systemd < 212
generator:sort value in OnCalendar
copyright: add "MD" newlines and authors
add authors in LICENSE too
Merge pull request #13 from a-detiste/master

merge in of systemd-crontab-generator