v1.8.0-enhanched

This version adds possibility to export secrets without conversion to a string.
To export this format, use
safe export -n [PATH]
It also provides option to import with appendmode only. This checks if latest
version of imported secret is not deleted nor destroyed and then compares this
to latest existing secret in Vault. If secrets are not equal, new version of secret
is added. To use this, use
`safe import -a <importfile.json

I will make pull request to get these changes incorporated into safe upstream.