Change examples to use Display instead of Debug.

[iliekturtles]

mks and si examples are updated to use format_args or
into_format_args as appropriate so that the Display trait can be
used to display quantities in specific units. Part of #123.

[adamreichold]

Rustfmt does seem to have a nit to add:

diff --git a/examples/mks.rs b/examples/mks.rs
index 76aa92e..568d542 100644
--- a/examples/mks.rs
+++ b/examples/mks.rs
@@ -3,14 +3,17 @@
 #[macro_use]
 extern crate uom;
 
-use uom::fmt::DisplayStyle::*;
 use length::{foot, meter};
+use uom::fmt::DisplayStyle::*;
 
 fn main() {
     let l1 = f32::Length::new::<meter>(100.0);
 
-    println!("{} = {}",
-        l1.into_format_args(meter, Abbreviation), l1.into_format_args(foot, Abbreviation));
+    println!(
+        "{} = {}",
+        l1.into_format_args(meter, Abbreviation),
+        l1.into_format_args(foot, Abbreviation)
+    );
 }
 
 #[macro_use]
diff --git a/examples/si.rs b/examples/si.rs
index 0cab985..fd1deb8 100644
--- a/examples/si.rs
+++ b/examples/si.rs
@@ -22,20 +22,23 @@ fn main() {
     let s = Time::format_args(second, Abbreviation);
 
     // Print results of simple formulas using different output units.
-    println!("{} + {} = {}",
+    println!("{} + {} = {}", m.with(l1), cm.with(l2), m.with(l1 + l2));
+    println!(
+        "{} + {} = {}",
         m.with(l1),
         cm.with(l2),
-        m.with(l1 + l2));
-    println!("{} + {} = {}",
-        m.with(l1),
-        cm.with(l2),
-        (l1 + l2).into_format_args(kilometer, Abbreviation));
-    println!("{} / {} = {}",
+        (l1 + l2).into_format_args(kilometer, Abbreviation)
+    );
+    println!(
+        "{} / {} = {}",
         m.with(l1),
         s.with(t1),
-        v1.into_format_args(meter_per_second, Abbreviation));
-    println!("{} / {} = {}",
+        v1.into_format_args(meter_per_second, Abbreviation)
+    );
+    println!(
+        "{} / {} = {}",
         m.with(l1),
         s.with(t1),
-        v1.into_format_args(kilometer_per_second, Abbreviation));
+        v1.into_format_args(kilometer_per_second, Abbreviation)
+    );
 }

[adamreichold]

Personally, I am not overly fond of glob imports and would suggest avoiding them in examples for pedagogical reasons.

[iliekturtles]

Formatting fixes finally pushed. Had a corrupt rustup that took a bit to fix.

[adamreichold]

LGTM