Tools: update ci install script

.travis.yml

@@ -22,6 +22,8 @@ addons:
       - ccache
       - genromfs
       - libc6-i386
+      - libxml2-dev
+      - libxslt1-dev
       - python-pip
       - python-dev
       - zlib1g-dev

Tools/scripts/install-apt-ci.sh

@@ -4,7 +4,8 @@
 set -ex
 
 PKGS="build-essential gawk ccache genromfs libc6-i386 \
-      python-dev python-pip zlib1g-dev gcc-4.9 g++-4.9 cmake cmake-data" # clang-3.7 llvm-3.7"
+      libxml2-dev libxslt1-dev python-dev python-pip zlib1g-dev \
+      gcc-4.9 g++-4.9 cmake cmake-data" # clang-3.7 llvm-3.7"
 
 read -r UBUNTU_CODENAME <<<$(lsb_release -c -s)
 
@@ -20,4 +21,4 @@ fi
 #sudo add-apt-repository "deb http://llvm.org/apt/${UBUNTU_CODENAME}/ llvm-toolchain-${UBUNTU_CODENAME}-3.7 main" -y
 sudo apt-get -qq -y --force-yes update
 sudo apt-get -qq -y --force-yes remove clang llvm
-sudo apt-get -y --force-yes install $PKGS
+sudo apt-get -y --force-yes install $PKGS