webdriver: Make log output safe for windows prompt (#96)

* server: make log output safe for windows prompt

The characters "←" and "→" are obfuscated in the Windows command
prompt.  Use ASCII versions.

Source-Repo: https://github.com/mozilla/webdriver-rust
Source-Revision: 6de6e225e14b545381719e2e97398bc1a8f87b13

committer: jgraham <james@hoppipolla.co.uk>

--HG--
extra : subtree_source : http%3A//tristan.corp.lon2.mozilla.com%3A8000
extra : subtree_revision : 549018e98173ca5c72e4ecb32c7cf9c0cf363527

testing/webdriver/src/server.rs

@@ -173,7 +173,7 @@ impl<U: WebDriverExtensionRoute> Handler for HttpHandler<U> {
             req.read_to_string(&mut body).unwrap();
         }
 
-        debug!("→ {} {} {}", req.method, req.uri, body);
+        debug!("-> {} {} {}", req.method, req.uri, body);
 
         match req.uri {
             AbsolutePath(path) => {
@@ -218,7 +218,7 @@ impl<U: WebDriverExtensionRoute> Handler for HttpHandler<U> {
                     Err(err) => (err.http_status(), err.to_json_string()),
                 };
 
-                debug!("← {} {}", status, resp_body);
+                debug!("<- {} {}", status, resp_body);
 
                 {
                     let resp_status = res.status_mut();