Stick with the old version

.travis.yml

@@ -4,7 +4,7 @@ python:
   - 3.4
 
 install:
-  - pip install mkdocs
+  - pip install mkdocs == 0.16.3
   - python setup.py install
 
 script:

mkdocs.yml

@@ -103,6 +103,4 @@ extra_css:
 
 docs_dir: 'docs'
 
-theme:
-    name: 'yeti'
-    custom_dir: 'yeti'
+theme_dir: 'yeti'