Add travis build

Author: weiznich

.travis.yml

@@ -0,0 +1,14 @@
+sudo: false
+language: rust
+rust:
+  - nightly
+  - beta
+  - stable
+script:
+  - cargo build --verbose
+addons:
+  apt:
+    sources:
+        - kalakris-cmake
+    packages:
+        - cmake

README.md

@@ -1,4 +1,6 @@
 # crates-mirror
+[![Build Status](https://travis-ci.org/weiznich/crates-mirror.svg?branch=master)](https://travis-ci.org/weiznich/crates-mirror)
+
 
 Crates-Mirror is a simple tool to provide a caching mirror for [crates.io](https://crates.io/). It's serving a local index which is synced with a remote index. All requested crates are downloaded and cached localy for further usage.
 

src/main.rs

@@ -372,7 +372,7 @@ fn main() {
 }
 
 
-pub fn credentials(url: &str,
+pub fn credentials(_url: &str,
                    user_from_url: Option<&str>,
                    _cred: git2::CredentialType)
                    -> Result<git2::Cred, git2::Error> {