Make cron configurable by user and add a backup now option

Closes #1
Closes #2

Update index.js

added destination (folder) support

Update README.md

updated readme to include destination

stict mode,
added timestamp to filename

add timestamp to uploaded file
enable strict mode
v bump

add callback to sync function

exit process on successful callback

fix -n callback

have binary script return non-zero status on failure

fix bug in cron.timezone parsing

Remove hard dependency on `time` module, but state that its installation is necessary for use of optional "timezone" specification.

Cleaned things up