Add initial Travis CI config. (#9)

Author: gavanderhoorn

.travis.yml

@@ -0,0 +1,25 @@
+language: generic
+services:
+  - docker
+
+cache:
+  directories:
+    - $HOME/.ccache
+
+git:
+  quiet: true
+
+env:
+  global:
+    - CATKIN_LINT=true
+    - CCACHE_DIR=$HOME/.ccache
+    - ROS_REPO=ros
+  matrix:
+    - ROS_DISTRO="kinetic"
+    - ROS_DISTRO="melodic"
+
+install:
+  - git clone --depth=1 -b master https://github.com/ros-industrial/industrial_ci.git .ci_config
+
+script:
+  - .ci_config/travis.sh