fix(macros): makes macro errors consistent with others

Mainly this is newline fixes

Closes #118

src/macros.rs

@@ -227,18 +227,17 @@ macro_rules! value_t_or_exit {
                 match v.parse::<$t>() {
                     Ok(val) => val,
                     Err(e)  => {
-                        println!("{} isn't a valid {}\n\t{}\n{}\nPlease re-run with --help for \
+                        println!("'{}' isn't a valid value\n\t{}\n\n{}\n\nPlease re-run with --help for \
                             more information",
                             v,
-                            stringify!($t),
                             e,
                             $m.usage());
                         ::std::process::exit(1);
                     }
                 }
             },
             None => {
-                println!("Argument \"{}\" not found or is not valid\n{}\nPlease re-run with \
+                println!("The argument '{}' was not found or is not valid\n\n{}\n\nPlease re-run with \
                     --help for more information",
                     $v,
                     $m.usage());
@@ -266,7 +265,7 @@ macro_rules! value_t_or_exit {
                 tmp
             },
             None => {
-                println!("Argument \"{}\" not found or is not valid\n{}\nPlease re-run with \
+                println!("The argument '{}' not found or is not valid\n\n{}\n\nPlease re-run with \
                     --help for more information",
                     $v,
                     $m.usage());