Moves to the new Travis CI infrastructure.

Enable 'ccache' for caching 'gcc'.

.travis.yml

@@ -3,20 +3,31 @@ language: c
 compiler:
     - gcc
 
-before_install:
-    - sudo add-apt-repository --yes ppa:vala-team
-    - sudo apt-get update --quiet
-    - sudo apt-get install --yes --force-yes valac libglib2.0-bin libglib2.0-dev
-      libsoup2.4-dev libgee-0.8-dev libfcgi-dev libctpl-dev python-pip
-    - sudo pip install cpp-coveralls sphinx PyYAML
+cache: ccache
+
+addons:
+    apt:
+        sources:
+            - vala-team
+        packages:
+            - valac
+            - libglib2.0-bin
+            - libglib2.0-dev
+            - libsoup2.4-dev
+            - libgee-0.8-dev
+            - libfcgi-dev
+            - libctpl-dev
+            - python-pip
+
+install:
+    - pip install --user cpp-coveralls sphinx PyYAML
 
 before_script:
-    - ./waf configure --enable-gcov --prefix=/usr
+    - ./waf configure --enable-gcov
     - ./waf build
-    - sudo ./waf install
 
 script:
-    - build/tests/tests
+    - LD_LIBRARY_PATH=build build/tests/tests
     - sphinx-build docs build/docs
 
 after_success: