Fix check build

.travis.yml

@@ -13,6 +13,8 @@ matrix:
             - ubuntu-restricted-extras
             - ffmpeg
             - libavcodec-extra-54
+      before_script:
+        ffmpeg --help
     - python: 3.6
       addons:
         apt:
@@ -22,6 +24,8 @@ matrix:
             - ubuntu-restricted-extras
             - ffmpeg
             - libavcodec-extra-54
+      before_script:
+        ffmpeg --help
     - python: 3.7
       dist: xenial
       sudo: true
@@ -29,6 +33,8 @@ matrix:
         - sudo add-apt-repository ppa:mc3man/xerus-media -y
         - sudo apt-get update -qq
         - sudo apt-get install -qq ubuntu-restricted-extras ffmpeg
+      before_script:
+        ffmpeg --help
     - python: 3.6
       env: TOXENV=check
   allow_failures:
@@ -36,9 +42,6 @@ matrix:
 
 install: pip install -U tox-travis
 
-before_script:
-  ffmpeg --help
-
 script: tox
 
 after_success:

MANIFEST.in

@@ -6,9 +6,10 @@ include README.rst
 include requirements.txt
 include tox.ini
 recursive-include docs *
-recursive-exclude docs *.pyc
-recursive-exclude docs *.pyo
 prune docs/_build
 recursive-include sigal/themes *
 include sigal/templates/sigal.conf.py
 recursive-include tests *
+prune tests/sample/_build
+recursive-exclude * *.pyc
+recursive-exclude * *.pyo