Vendor dependencies

Let's see how I like this workflow.

vendor/procfs/examples/mountinfo.rs

@@ -0,0 +1,28 @@
+use procfs::process::Process;
+use std::collections::HashSet;
+
+fn main() {
+    for mount in Process::myself().unwrap().mountinfo().unwrap() {
+        let (a, b): (HashSet<_>, HashSet<_>) = mount
+            .mount_options
+            .into_iter()
+            .chain(mount.super_options)
+            .partition(|&(_, ref m)| m.is_none());
+
+        println!(
+            "{} on {} type {} ({})",
+            mount.mount_source.unwrap_or_else(|| "None".to_string()),
+            mount.mount_point.display(),
+            mount.fs_type,
+            a.into_iter().map(|(k, _)| k).collect::<Vec<_>>().join(",")
+        );
+
+        for (opt, val) in b {
+            if let Some(val) = val {
+                println!("  {} = {}", opt, val);
+            } else {
+                println!("  {}", opt);
+            }
+        }
+    }
+}