Add Travis for unit tests

.travis.yml

+
+language: cpp
+dist: trusty
+notifications:
+  email: false
+
+before_install:
+ - sudo add-apt-repository ppa:beineri/opt-qt-5.10.1-trusty -y
+ - sudo apt-get update -q
+ - sudo apt-get install -qq qt510base 
+ - source /opt/qt510/bin/qt510-env.sh
+
+script:
+    - cd test
+    - mkdir build
+    - cd build 
+    - cmake ../
+    - make
+    - ./libdap-test
+
+