tuner's tests are failing on nightly

[Bujiraso]

On nightly, a "cargo test" yields the following errors:

error[E0308]: mismatched types
   --> src/effects/tuner.rs:185:32
    |
185 |         let tuner = Tuner::new(sampling_rate, length);
    |                                ^^^^^^^^^^^^^ expected usize, found f32

error[E0599]: no method named `tune` found for type `effects::tuner::Tuner` in the current scope
   --> src/effects/tuner.rs:187:26
    |
12  | pub struct Tuner {
    | ---------------- method `tune` not found for this
...
187 |         let note = tuner.tune();
    |                          ^^^^

error: aborting due to 2 previous errors

The first one was easy to fix, as shown in the following patch:

---
 src/effects/tuner.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/effects/tuner.rs b/src/effects/tuner.rs
index 85994b1..45c1c05 100644
--- a/src/effects/tuner.rs
+++ b/src/effects/tuner.rs
@@ -182,7 +182,7 @@ mod tests {
                 ((2. * PI) * freq * t).sin() 
             }).collect();
 
-        let tuner = Tuner::new();
+        let tuner = Tuner::new(sampling_rate as usize, length);
         tuner.process_samples(&sin_vec, &mut vec![], &mut vec![]);
         let note = tuner.tune();
 
-- 
2.17.1

The second, I'm not sure if there is a "tuner.tune()" equivalent, anymore. It sems the tuner doesn't have the calculate_spectrum or tune functions, and then has no equivalent functtion that returns a simple note.

[Bujiraso]

Might be easiest to delete the test, if it no longer applies, too.