Make sure Libmacgpg can be downgraded.
[FIX] Sanitize config settings before storing them to avoid breaking gpg.conf [#131 state:fixed]

- gpg.conf can't process config settings with \n characters and reports an invalid config error if it
  detects these characters since everything after the \n is interpreted as a new config setting.
- To avoid breaking the gpg.conf this way, each setting is sanatized by removing \n characters before being stored in gpg.conf