Make it so the docs build without an install

.travis.yml

@@ -21,6 +21,7 @@ env:
   - TOXENV=py32 SODIUM_INSTALL=system CC=clang
   - TOXENV=py33 SODIUM_INSTALL=system CC=clang
   - TOXENV=pypy SODIUM_INSTALL=system CC=clang
+  - docs
 
 install:
   # Add the PyPy repository

docs/conf.py

@@ -194,6 +194,9 @@ class Mock(object):
         else:
             return Mock()
 
+    def __floordiv__(self, other):
+        return Mock()
+
 MOCK_MODULES = [
     "cffi", "cffi.vengine_cpy", "cffi.vengine_gen", "cffi.verifier",
 ]

docs/signing.rst

@@ -60,7 +60,7 @@ Reference
 .. autoclass:: nacl.signing.SignedMessage
     :members:
 
-.. autoclass:: nacl.signing.BadSignatureError
+.. autoclass:: nacl.exceptions.BadSignatureError
     :members:
 
 

tox.ini

@@ -13,7 +13,6 @@ commands =
 [testenv:docs]
 deps =
     sphinx
-    cffi
 basepython = python2.7
 commands =
     sphinx-build -W -b html -d {envtmpdir}/doctrees docs docs/_build/html