add travis support

Author: vmaffione

.travis.yml

@@ -0,0 +1,8 @@
+dist: trusty
+sudo: required
+language: c
+script:
+  - "git clone https://github.com/netmap-unipi/netmap"
+  - "cd netmap && ./configure --no-drivers && make && sudo make install"
+  - "cd codelab && make"
+  - "cd solutions && make"