add configuration file for Travis CI

Signed-off-by: Steve Markgraf <steve@steve-m.de>

.travis.yml

@@ -0,0 +1,10 @@
+language: c
+compiler:
+  - gcc
+  - clang
+
+before_install:
+ - sudo apt-get update -qq
+ - sudo apt-get install -qq libusb-1.0-0-dev
+
+script: cmake . && make && sudo make install