Some minor performance tweaks.

This includes moving basename-only globs into separate regexes. The hope
is that if the regex processes less input, it will be faster.

src/ignore.rs

@@ -19,6 +19,7 @@ use std::io;
 use std::path::{Path, PathBuf};
 
 use gitignore::{self, Gitignore, GitignoreBuilder, Match, Pattern};
+use pathutil::is_hidden;
 use types::Types;
 
 const IGNORE_NAMES: &'static [&'static str] = &[
@@ -377,14 +378,6 @@ impl Overrides {
     }
 }
 
-fn is_hidden<P: AsRef<Path>>(path: P) -> bool {
-    if let Some(name) = path.as_ref().file_name() {
-        name.to_str().map(|s| s.starts_with(".")).unwrap_or(false)
-    } else {
-        false
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use std::path::Path;