Fix warning about unknown project type

Result.or() gets executed even when the value is Result::Ok, which
causes the warning about "Unknown project type" to show even though the
project directory was successfully found. It also unnecessarily
traverses the directory tree in search for VCS files.

Author: Martina Kollarova

src/utils.rs

@@ -27,12 +27,12 @@ pub fn get_rootPath<'a>(path: &'a Path, languageId: &str) -> Result<&'a Path> {
         "haskell" => traverse_up(path, |dir| dir.join("stack.yaml").exists())
             .or_else(|_| traverse_up(path, |dir| dir.join(".cabal").exists())),
         _ => Err(format_err!("Unknown languageId: {}", languageId)),
-    }.or({
+    }.or_else(|_| {
         traverse_up(path, |dir| {
             dir.join(".git").exists() || dir.join(".hg").exists() || dir.join(".svn").exists()
         })
     })
-        .or({
+        .or_else(|_| {
             let parent = path.parent()
                 .ok_or_else(|| format_err!("Failed to get file dir"));
             warn!(