update project metadata

new readme
readme as setup.py long_description
links in changes
git in authors
add travis osx env
break out docs build in travis
remove python_requires for now

.travis.yml

@@ -4,7 +4,9 @@ language: python
 matrix:
   include:
     - python: 3.6
-      env: TOXENV=py,simplejson,devel,lowest,codecov,docs-html
+      env: TOXENV=py,simplejson,devel,lowest,codecov
+    - python: 3.6
+      env: TOXENV=docs-html
     - python: 3.5
       env: TOXENV=py,codecov
     - python: 3.4
@@ -15,9 +17,16 @@ matrix:
       env: TOXENV=py,codecov
     - python: nightly
       env: TOXENV=py
+    - os: osx
+      language: generic
+      env: TOXENV=py
   allow_failures:
     - python: nightly
       env: TOXENV=py
+    - os: osx
+      language: generic
+      env: TOXENV=py
+  fast_finish: true
 
 install:
   - pip install tox