Compact output, add -s color option, closes #70

Strip the empty lines within the results for each benchmark, but keep
the empty line between each benchmark, and before the summary.

Add `color` style option to show color but not be interactive (no
progress bar).

src/hyperfine/internal.rs

@@ -12,14 +12,14 @@ pub const MIN_EXECUTION_TIME: Second = 5e-3;
 /// Return a pre-configured progress bar
 pub fn get_progress_bar(length: u64, msg: &str, option: &OutputStyleOption) -> ProgressBar {
     let progressbar_style = match *option {
-        OutputStyleOption::Basic => ProgressStyle::default_bar(),
+        OutputStyleOption::Basic | OutputStyleOption::Color => ProgressStyle::default_bar(),
         _ => ProgressStyle::default_spinner()
             .tick_chars("⠋⠙⠹⠸⠼⠴⠦⠧⠇⠏")
-            .template(" {spinner} {msg:<30} {wide_bar} ETA {eta_precise}"),
+            .template("\n {spinner} {msg:<30} {wide_bar} ETA {eta_precise}"),
     };
 
     let progress_bar = match *option {
-        OutputStyleOption::Basic => ProgressBar::hidden(),
+        OutputStyleOption::Basic | OutputStyleOption::Color => ProgressBar::hidden(),
         _ => ProgressBar::new(length),
     };
     progress_bar.set_style(progressbar_style.clone());
@@ -63,7 +63,7 @@ pub fn write_benchmark_comparison(results: &Vec<BenchmarkResult>) {
         }
     }
 
-    println!("{}\n", "Summary".bold());
+    println!("{}", "Summary".bold());
     println!("  '{}' ran", fastest_item.command.cyan());
     longer_items.sort_by(|l, r| l.mean.partial_cmp(&r.mean).unwrap_or(Ordering::Equal));