Add Travis CI configuration file

Signed-off-by: Antonio Niño Díaz <antonio_nd@outlook.com>

.travis-deps.sh

@@ -0,0 +1,13 @@
+#!/bin/sh
+
+if [ $TRAVIS_OS_NAME = "osx" ]; then
+    brew update
+    brew install libpng pkg-config
+else # linux
+    sudo apt-get -qq update
+    sudo apt-get install -y -q bison flex libpng-dev pkg-config
+fi
+
+echo "Dependencies:"
+yacc --version
+flex --version