use trusty for testing, to have a recent FUSE

.travis.yml

@@ -10,12 +10,15 @@ matrix:
     include:
         - python: 3.4
           os: linux
+          dist: trusty
           env: TOXENV=py34
         - python: 3.5
           os: linux
+          dist: trusty
           env: TOXENV=py35
         - python: 3.5
           os: linux
+          dist: trusty
           env: TOXENV=flake8
         - language: generic
           os: osx

.travis/install.sh

@@ -31,7 +31,6 @@ if [[ "$(uname -s)" == 'Darwin' ]]; then
     python -m pip install --user 'virtualenv<14.0'
 else
     pip install 'virtualenv<14.0'
-    sudo add-apt-repository -y ppa:gezakovacs/lz4
     sudo apt-get update
     sudo apt-get install -y liblz4-dev
     sudo apt-get install -y libacl1-dev