Merge pull request #1906 from janisozaur/language-dat

fix travis builds by forcing it to ubuntu 14.04

.travis.yml

@@ -17,3 +17,6 @@ cache:
     apt: true
 
 sudo: required
+
+services:
+    - docker

install.sh

@@ -74,6 +74,7 @@ if [[ `uname` == "Darwin" ]]; then
         popd
     fi
 elif [[ `uname` == "Linux" ]]; then
+	sudo apt-get update
 	if [[ -z "$TRAVIS" ]]; then
 	    sudo apt-get install -y binutils-mingw-w64-i686 gcc-mingw-w64-i686 g++-mingw-w64-i686 cmake
 		if [[ -z "$DISABLE_G2_BUILD" ]]; then