added lzma install to travis build

Author: walaj

.travis.yml

@@ -49,6 +49,7 @@ env:
 before_install: 
 - sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y
 - sudo apt-get -qq update
+- sudo apt-get install lzma
 - if [ "${TRAVIS_BRANCH}" = "master" ]; then export BOOST_VERSION="${BOOST_VERSION_MIN}"; else export BOOST_VERSION="${BOOST_VERSION_MAX}"; fi
 - if [ -n "${BOOST_VERSION}" ]; then export BOOST_ROOT="${TRAVIS_BUILD_DIR}/../boost-trunk"; export CMAKE_MODULE_PATH="${BOOST_ROOT}"; fi
 - if [ "${TRAVIS_OS_NAME}" = "osx" -a "${CXX}" = "clang++" ]; then export CXX="$(which c++)"; export CC="$(which cc)"; fi