Add TravisCI.

Now the project is build on every PR using TravisCI.

The project dependencies are get from the archive generated by kiwix-build.

travis/install_deps.sh

@@ -0,0 +1,51 @@
+#!/usr/bin/env bash
+
+set -e
+
+
+REPO_NAME=${TRAVIS_REPO_SLUG#*/}
+ARCHIVE_NAME=deps_${PLATFORM}_${REPO_NAME}.tar.gz
+SSH_KEY=${TRAVIS_BUILD_DIR}/travis/travisci_builder_id_key
+
+
+# Packages.
+case ${PLATFORM} in
+     "native_static")
+         PACKAGES="gcc cmake libbz2-dev ccache zlib1g-dev uuid-dev libctpp2-dev"
+         ;;
+     "native_dyn")
+         PACKAGES="gcc cmake libbz2-dev ccache zlib1g-dev uuid-dev libctpp2-dev libmicrohttpd-dev"
+         ;;
+     "win32_static")
+         PACKAGES="g++-mingw-w64-i686 gcc-mingw-w64-i686 gcc-mingw-w64-base mingw-w64-tools ccache"
+         ;;
+     "win32_dyn")
+         PACKAGES="g++-mingw-w64-i686 gcc-mingw-w64-i686 gcc-mingw-w64-base mingw-w64-tools ccache"
+         ;;
+     "android_arm")
+         PACKAGES="gcc cmake ccache"
+         ;;
+     "android_arm64")
+         PACKAGES="gcc cmake ccache"
+         ;;
+esac
+
+sudo apt-get update -qq
+sudo apt-get install -qq python3-pip ${PACKAGES}
+pip3 install meson
+
+# Ninja
+cd $HOME
+git clone git://github.com/ninja-build/ninja.git
+cd ninja
+git checkout release
+./configure.py --bootstrap
+sudo cp ninja /bin
+
+
+# Dependencies comming from kiwix-build.
+cd ${HOME}
+scp -v -p -i ${SSH_KEY} nightlybot@download.kiwix.org:~/travis_deps/${ARCHIVE_NAME} .
+mkdir -p BUILD_${PLATFORM}
+cd BUILD_${PLATFORM}
+tar xf ${HOME}/${ARCHIVE_NAME}