move service to submodule; update travis config

.travis.yml

@@ -14,6 +14,16 @@ matrix:
   allow_failures:
     - rust: nightly
 
+env:
+  global:
+    - RUSTFLAGS="-C link-dead-code"
+    - OPENSSL_VERSION=openssl-1.0.2
+
+before_install:
+  - sudo add-apt-repository -y ppa:0k53d-karl-f830m/openssl
+  - sudo apt-get update -qq
+  - sudo apt-get install -y openssl libssl-dev libelf-dev libdw-dev cmake gcc binutils-dev libiberty-dev
+
 before_script:
   - export PATH=$PATH:~/.cargo/bin
 

src/service/mod.rs

@@ -0,0 +1,3 @@
+mod senderror;
+
+pub use self::senderror::{SendError, SendResponse};