Vendor dependencies for 0.3.0 release

vendor/flate2/examples/zlibencoder-write.rs

@@ -0,0 +1,10 @@
+use flate2::write::ZlibEncoder;
+use flate2::Compression;
+use std::io::prelude::*;
+
+// Vec<u8> implements Write to print the compressed bytes of sample string
+fn main() {
+    let mut e = ZlibEncoder::new(Vec::new(), Compression::default());
+    e.write_all(b"Hello World").unwrap();
+    println!("{:?}", e.finish().unwrap());
+}