Remove time dependency & try bump libc

I'm not on a system capable of testing, but currently our own dependency
causes cargo to pull down both libc 0.1 & 0.2. We should update to libc 0.2
to combine dependencies. time is deprecated in favor of std::time

Author: serprex

Cargo.toml

@@ -15,9 +15,8 @@ exclude = [
 ]
 
 [dependencies]
-libc = "0.1.10"
+libc = "0.2"
 num  = "0.1.27"
-time = "0.1.32"
 lazy_static = "0.2.1"
 
 [build-dependencies]

examples/pi.rs

@@ -1,8 +1,7 @@
 #[macro_use(mem_info)]
 extern crate arrayfire as af;
-extern crate time;
 
-use time::PreciseTime;
+use std::time::Instant;
 use af::*;
 
 #[allow(unused_must_use)]
@@ -16,7 +15,7 @@ fn main() {
     let x = &randu::<f32>(dims);
     let y = &randu::<f32>(dims);
 
-    let start = PreciseTime::now();
+    let start = Instant::now();
 
     mem_info!("Before benchmark");
 
@@ -30,9 +29,7 @@ fn main() {
         let pi_val = real*4.0/(samples as f64);
     }
 
-    let end = PreciseTime::now();
-
-    println!("Estimated Pi Value in {} seconds", start.to(end) / 100);
+    println!("Estimated Pi Value in {:?}", start.elapsed());
 
     mem_info!("After benchmark");
 }