make tox install package to link api docs

Author: CosmoMatt

tox.ini

@@ -50,6 +50,6 @@ commands =
 description = Build HTML docs with sphinx
 deps = 
     -r{toxinidir}{/}requirements{/}requirements-docs.txt
-skip_install = true
+skip_install = False
 commands =
     sphinx-build -M html {toxinidir}{/}docs {toxinidir}{/}docs{/}_build -Q