add setup.py, add pypi to travis.yml, misc. tweaks for pypi

Changes per instructions here:

adafruit/circuitpython#979

...builds locally.  Let's see what Travis thinks.

Author: brennen

.travis.yml

@@ -1,31 +1,28 @@
-# This is a common .travis.yml for generating library release zip files for
-# CircuitPython library releases using circuitpython-build-tools.
-# See https://github.com/adafruit/circuitpython-build-tools for detailed setup
-# instructions.
-
 dist: trusty
 sudo: false
 language: python
 python:
-    - "3.6"
-
+- '3.6'
 cache:
-    pip: true
-
+  pip: true
 deploy:
-  provider: releases
-  api_key: $GITHUB_TOKEN
-  file_glob: true
-  file: $TRAVIS_BUILD_DIR/bundles/*
-  skip_cleanup: true
-  on:
-    tags: true
-
+-  provider: releases
+   api_key: "$GITHUB_TOKEN"
+   file_glob: true
+   file: "$TRAVIS_BUILD_DIR/bundles/*"
+   skip_cleanup: true
+   on:
+     tags: true
+- provider: pypi
+  user: adafruit-travis
+  password:
+    secure: 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
 install:
-  - pip install pylint circuitpython-build-tools Sphinx sphinx-rtd-theme
-
+- pip install -r requirements.txt
+- pip install pylint circuitpython-build-tools Sphinx sphinx-rtd-theme
 script:
-  - pylint adafruit_ads1x15/*.py
-  - ([[ ! -d "examples" ]] || pylint --disable=missing-docstring,invalid-name examples/*.py)
-  - circuitpython-build-bundles --filename_prefix adafruit-circuitpython-ads1x15 --library_location .
-  - cd docs && sphinx-build -E -W -b html . _build/html
+- pylint adafruit_ads1x15/*.py
+- ([[ ! -d "examples" ]] || pylint --disable=missing-docstring,invalid-name examples/*.py)
+- circuitpython-build-bundles --filename_prefix adafruit-circuitpython-ads1x15 --library_location
+  .
+- cd docs && sphinx-build -E -W -b html . _build/html && cd ..

docs/conf.py

@@ -15,11 +15,6 @@
     'sphinx.ext.viewcode',
 ]
 
-# Uncomment the below if you use native CircuitPython modules such as
-# digitalio, micropython and busio. List the modules you use. Without it, the
-# autodoc module docs will fail to generate with a warning.
-autodoc_mock_imports = ["adafruit_bus_device", "micropython"]
-
 intersphinx_mapping = {'python': ('https://docs.python.org/3.4', None),'BusDevice': ('https://circuitpython.readthedocs.io/projects/busdevice/en/latest/', None),'Register': ('https://circuitpython.readthedocs.io/projects/register/en/latest/', None),'CircuitPython': ('https://circuitpython.readthedocs.io/en/latest/', None)}
 
 # Add any paths that contain templates here, relative to this directory.

requirements.txt

@@ -1 +1,2 @@
-adafruit-circuitpython-bus-device
+Adafruit-Blinka
+adafruit-circuitpython-busdevice

setup.py

@@ -0,0 +1,62 @@
+"""A setuptools based setup module.
+
+See:
+https://packaging.python.org/en/latest/distributing.html
+https://github.com/pypa/sampleproject
+"""
+
+from setuptools import setup, find_packages
+# To use a consistent encoding
+from codecs import open
+from os import path
+
+here = path.abspath(path.dirname(__file__))
+
+# Get the long description from the README file
+with open(path.join(here, 'README.rst'), encoding='utf-8') as f:
+    long_description = f.read()
+
+setup(
+    name='adafruit-circuitpython-ads1x15',
+
+    use_scm_version=True,
+    setup_requires=['setuptools_scm'],
+
+    description='CircuitPython library for controlling an ADS1x15 ADC.',
+    long_description=long_description,
+    long_description_content_type='text/x-rst',
+
+    # The project's main homepage.
+    url='https://github.com/adafruit/Adafruit_CircuitPython_ADS1x15',
+
+    # Author details
+    author='Adafruit Industries',
+    author_email='[email protected]',
+
+    install_requires=[
+        'Adafruit-Blinka',
+        'adafruit-circuitpython-busdevice'
+    ],
+
+    # Choose your license
+    license='MIT',
+
+    # See https://pypi.python.org/pypi?%3Aaction=list_classifiers
+    classifiers=[
+        'Development Status :: 3 - Alpha',
+        'Intended Audience :: Developers',
+        'Topic :: Software Development :: Libraries',
+        'Topic :: System :: Hardware',
+        'License :: OSI Approved :: MIT License',
+        'Programming Language :: Python :: 3',
+        'Programming Language :: Python :: 3.4',
+        'Programming Language :: Python :: 3.5',
+    ],
+
+    # What does your project relate to?
+    keywords='adafruit ads1x115 adc hardware micropython circuitpython',
+
+    # You can just specify the packages manually here if your project is
+    # simple. Or you can use find_packages().
+    packages=['adafruit_ads1x15'],
+)