Vendor dependencies for 0.3.0 release

vendor/roxmltree/examples/ast.rs

@@ -0,0 +1,19 @@
+fn main() {
+    let args: Vec<_> = std::env::args().collect();
+
+    if args.len() != 2 {
+        println!("Usage:\n\tcargo run --example ast -- input.xml");
+        std::process::exit(1);
+    }
+
+    let text = std::fs::read_to_string(&args[1]).unwrap();
+
+    let opt = roxmltree::ParsingOptions {
+        allow_dtd: true,
+        ..roxmltree::ParsingOptions::default()
+    };
+    match roxmltree::Document::parse_with_options(&text, opt) {
+        Ok(doc) => print!("{:?}", doc),
+        Err(e) => println!("Error: {}.", e),
+    }
+}