Add tox.ini, remove funcsigs, fix setup.py adding submodule names and update docs, update travis for using tox

.travis.yml

@@ -1,30 +1,26 @@
 language: python
-# cache: pip
 
 addons:
   apt:
     packages:
     - redis-server
 
-python:
-  # major versions, test first
-  - "2.7"
-  - "3.5-dev"
-  # other versions
-  - "2.6"
-  - "3.3"
-  - "3.4"
-  - "3.5"
-  - "nightly"
-  - "pypy"
-  # not included, for incompatibility
-  # - "2.5" # tarvis errs
-  # - "3.2" # humanfriendly cant install
-  # - "pypy3" # psutil errs
-
-install: 
-  - "pip install --upgrade -r requirements.txt"     
-  - "pip install ."
+  env:
+    matrix:
+      # major versions, test first
+      - TOXENV=py27
+      - TOXENV=py35
+      # other versions
+      - TOXENV=py26
+      - TOXENV=py33
+      - TOXENV=py34
+      - TOXENV=py35
+      - TOXENV=pypy
+      - TOXENV=pypy3
+      # not included, for incompatibility
+      # - "2.5" # tarvis errs
+      # - "3.2" # humanfriendly cant install
+      # - "pypy3" # psutil errs
 
 # command to run tests
-script: py.test -v
+script: tox