Add slop example

Author: drusellers

examples/22_stop_parsing_with_--.rs

@@ -0,0 +1,24 @@
+extern crate clap;
+
+use clap::{App, Arg};
+
+/// myprog -f -p=bob -- sloppy slop slop
+fn main() {
+
+    let matches = App::new("myprog")
+        .arg(Arg::with_name("eff")
+            .short("f"))
+        .arg(Arg::with_name("pea")
+             .short("p")
+             .takes_value(true))
+        .arg(Arg::with_name("slop")
+             .multiple(true))
+        .get_matches();
+
+
+    println!("-f used: {:?}", matches.is_present("eff"));
+    println!("-p's value: {:?}", matches.value_of("pea"));
+    println!("'slops' values: {:?}", matches.values_of("slop").map(|vals| vals.collect::<Vec<_>>()));
+
+    // Continued program logic goes here...
+}