json config for org registration

[4meta5]

#110 (comment)

The CLI input format for BatchIssueShares, BatchBurnShares, and RegisterWeightedOrg is not convenient.

#[derive(Clone, Debug)]
pub struct AccountShare(pub String, pub u64);
impl FromStr for AccountShare {
    type Err = Error;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        let coords: Vec<&str> = s.trim_matches(|p| p == '(' || p == ')' )
                                 .split(',')
                                 .collect();
        let acc_str = coords[0];
        let share_fromstr = coords[1].parse::<u64>().map_err(|_| Error::ParseIntError)?;
        Ok(AccountShare(acc_str.to_string(), share_fromstr))
    }
}

I'd prefer to use a .json file to register organizations because it's just poor usability to require the user to type out the members in the format above...

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