Renamed corrupt test gzip file (#277)

* Renamed corrupt gzip file in tests so it doesn't trip up virus scanners.

* Fixed broken example.

Author: billallen256

examples/gzencoder-read.rs

@@ -15,6 +15,6 @@ fn gzencoder_read_hello_world() -> io::Result<Vec<u8>> {
     let mut result = Vec::new();
     let c = b"hello world";
     let mut z = GzEncoder::new(&c[..], Compression::fast());
-    z.read_to_end(&mut ret_vec)?;
+    z.read_to_end(&mut result)?;
     Ok(result)
 }

tests/corrupt-file.gz renamed to tests/corrupt-gz-file.bin

@@ -33,7 +33,7 @@ fn test_extract_success_partial_multi() {
 // test extraction fails on a corrupt file
 #[test]
 fn test_extract_failure() {
-    let result = extract_file(Path::new("tests/corrupt-file.gz"));
+    let result = extract_file(Path::new("tests/corrupt-gz-file.bin"));
     assert_eq!(result.err().unwrap().kind(), io::ErrorKind::InvalidInput);
 }