Start working on Travis-CI integration

.travis.yml

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+language: c
+os: linux
+sudo: false
+
+matrix:
+  include:
+    - compiler: gcc
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+          packages:
+            - check
+            - libsubunit-dev
+            - gcc-5
+      env: COMPILER=gcc-5
+    - compiler: clang
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+            - llvm-toolchain-precise-3.8
+          packages:
+            - check
+            - libsubunit-dev
+            - clang-3.8
+      env: COMPILER=clang-3.8
+
+addons:
+  apt:
+    packages:
+      - check
+      - libsubunit-dev
+
+script: ./test.sh

test.sh

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+#!/bin/bash
+
+if [ "$COMPILER" ];
+then
+	export CC=$COMPILER
+fi
+cd contrib/ports/unix/check
+#build and run unit tests
+make clean all
+ERR=$?
+if [ $ERR != 0 ]; then
+       echo "unittests build failed"
+       exit 33
+fi
+make check