Add initial Travis config.

Force to use Trusty distr.
Enable tests build.
Enable tests run with CTest.

.travis.yml

@@ -0,0 +1,19 @@
+os:
+  - linux
+  - osx
+
+# Ubuntu 14.04 Trusty support, to get newer cmake and compilers.
+sudo: required
+dist: trusty
+
+language: cpp
+
+script:
+  - mkdir out && cd out
+  - cmake -DGFLAGS_BUILD_TESTING=True ..
+  - make
+  - ctest
+
+compiler:
+  - clang
+  - gcc