Implement new argument -f for use of file
Implement new argument -f for use of file

Add support to use and save the information to a specific file. By
changing this there is no need for the interactive parameter any longer
hence that is removed.

Signed-off-by: Joakim Bech <741f90e2a7f4d9afbad8bd50be20560f4cf38962@linaro.org>

jbech-linaro/jipdate