Merge pull request #44 from gkoz/ci

Travis: test with GTK 3.4 and 3.18

Author: GuillaumeGomez

.travis.yml

@@ -1,17 +1,18 @@
 language: rust
 rust:
-- nightly
-- stable
-sudo: true
-before_install:
-  - yes | sudo add-apt-repository ppa:ricotz/testing
-  - sudo apt-get update
-install:
-  - sudo apt-get install libgtk-3-dev
+  - nightly
+  - stable
+env:
+  - GTK=3.4
+  - GTK=latest
+addons:
+  apt:
+    packages:
+    - libgtk-3-dev
 script:
   - rustc --version
   - mkdir .cargo
   - echo 'paths = ["."]' > .cargo/config
   - git clone -q --depth 50 -b pending https://github.com/rust-gnome/examples _examples
   - cd _examples
-  - cargo build
+  - ./build.sh