Get rid of tempfile dependency.

Cargo.toml

@@ -129,7 +129,6 @@ tokio-uds = { version="0.2", optional = true }
 [dev-dependencies]
 env_logger = "0.6"
 serde_derive = "1.0"
-tempfile = "3.0"
 
 [build-dependencies]
 version_check = "0.1"

src/fs.rs

@@ -128,17 +128,30 @@ impl NamedFile {
     /// # Examples
     ///
     /// ```rust
-    /// extern crate tempfile;
     /// extern crate actix_web;
     ///
     /// use actix_web::fs::NamedFile;
-    /// use tempfile::tempfile;
     /// use std::io::{self, Write};
+    /// use std::env;
+    /// # use std::fs::{self, File};
+    /// # use std::path::PathBuf;
+    /// #
+    /// # fn path() -> PathBuf {
+    /// #     let mut path = env::temp_dir();
+    /// #     path.push("actix-web-named-file-test-from-file");
+    /// #     path
+    /// # }
+    /// #
+    /// # fn tempfile() -> Result<File, io::Error> {
+    /// #     let file = File::create(path())?;
+    /// #     Ok(file)
+    /// # }
     ///
     /// fn main() -> io::Result<()> {
     ///     let mut file = tempfile()?;
     ///     file.write_all(b"Hello, world!")?;
     ///     let named_file = NamedFile::from_file(file, "foo.txt")?;
+    /// #   fs::remove_file(path())?;
     ///     Ok(())
     /// }
     /// ```
@@ -169,17 +182,30 @@ impl<C: StaticFileConfig> NamedFile<C> {
     /// # Examples
     ///
     /// ```rust
-    /// extern crate tempfile;
     /// extern crate actix_web;
     ///
-    /// use actix_web::fs::{NamedFile, DefaultConfig};
-    /// use tempfile::tempfile;
+    /// use actix_web::fs::{DefaultConfig, NamedFile};
     /// use std::io::{self, Write};
+    /// use std::env;
+    /// # use std::fs::{self, File};
+    /// # use std::path::PathBuf;
+    /// #
+    /// # fn path() -> PathBuf {
+    /// #     let mut path = env::temp_dir();
+    /// #     path.push("actix-web-named-file-test-from-file-with-config");
+    /// #     path
+    /// # }
+    /// #
+    /// # fn tempfile() -> Result<File, io::Error> {
+    /// #     let file = File::create(path())?;
+    /// #     Ok(file)
+    /// # }
     ///
     /// fn main() -> io::Result<()> {
     ///     let mut file = tempfile()?;
     ///     file.write_all(b"Hello, world!")?;
     ///     let named_file = NamedFile::from_file_with_config(file, "foo.txt", DefaultConfig)?;
+    /// #   fs::remove_file(path())?;
     ///     Ok(())
     /// }
     /// ```
@@ -225,6 +251,7 @@ impl<C: StaticFileConfig> NamedFile<C> {
             _cd_map: PhantomData,
         })
     }
+
     /// Attempts to open a file in read-only mode using provided configuration.
     ///
     /// # Examples