Correctly load normalize.css in documentation pages

Recent versions of rustc is no longer importing normalize.css from main.css.
We need point fix link of the normalize.css to load it correctly.

Author: onur

src/docbuilder/chroot_builder.rs

@@ -368,10 +368,9 @@ impl DocBuilder {
         info!("Copying essential files for: {}", res.rustc_version);
 
         let files = (// files require rustc version subfix
-                     ["rustdoc.css", "main.css", "main.js", "jquery.js"],
+                     ["rustdoc.css", "main.css", "main.js", "jquery.js", "normalize.css"],
                      // files doesn't require rustc version subfix
-                     ["normalize.css",
-                      "FiraSans-Medium.woff",
+                     ["FiraSans-Medium.woff",
                       "FiraSans-Regular.woff",
                       "Heuristica-Italic.woff",
                       "SourceCodePro-Regular.woff",

src/utils/copy.rs

@@ -100,8 +100,12 @@ fn copy_html(source: &PathBuf,
 
     let reader = io::BufReader::new(source_file);
 
-    let replace_regex = Regex::new(r#"(href|src)="(.*)(main|jquery|rustdoc|playpen)\.(css|js)""#)
-        .unwrap();
+    // FIXME: We don't need to store common libraries (jquery and normalize) for the each version
+    //        of rustc. I believe storing only one version of this files should work in every
+    //        documentation page.
+    let replace_regex =
+        Regex::new(r#"(href|src)="(.*)(main|jquery|rustdoc|playpen|normalize)\.(css|js)""#)
+            .unwrap();
     let replace_str = format!("$1=\"{}../../$2$3-{}.$4\"",
                               if target { "../" } else { "" },
                               rustc_version);