o-o 0.5.4

Enables commands that assume the standard input and output to read and write to files specified in the command line.
Documentation 
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#[cfg(test)]
#[allow(non_snake_case)]
#[cfg(test)]
mod func_tests {
    use o_o::*;

    #[test]
    fn command_exists_for_ls() {
        let ls_command_exists = command_exists("ls");
        assert!(ls_command_exists);
    }

    #[test]
    fn command_exists_for_hoge4() {
        let h4_command_exists = command_exists("hoge-hoge-hoge-hoge");
        assert!(!h4_command_exists);
    }
}