potential fix for geckodriver thing

.travis.yml

@@ -1,8 +1,7 @@
 language: python
 cache: pip
-matrix:
-  include:
-      sudo: required
+addons:
+  firefox: "45.4.0esr"
 os:
   - linux
 python:
@@ -12,8 +11,10 @@ install:
   - pip install flake8
 before_script:
   # download and extract geckodrive to /usr/local/bin
-  - wget https://github.com/mozilla/geckodriver/releases/download/v0.23.0/geckodriver-v0.23.0-linux64.tar.gz && tar -C /usr/local/bin -xvf geckodriver-v0.23.0-linux64.tar.gz
-  # stop the build if there are Python syntax errors or undefined names
+  - wget https://github.com/mozilla/geckodriver/releases/download/v0.23.0/geckodriver-v0.23.0-linux64.tar.gz
+  - mkdir geckodriver
+  - tar -xzf geckodriver-v0.23.0-linux64.tar.gz -C geckodriver
+  - export PATH=$PATH:$PWD/geckodriver  # stop the build if there are Python syntax errors or undefined names
   - flake8 . --count --select=E901,E999,F821,F822,F823 --show-source --statistics
   # exit-zero treats all errors as warnings.  The GitHub editor is 127 chars wide
   - flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics