Introduces CI and tox testing, fixes #679

- run setup.py on both Python2 and Python3
- runs simple test case for both Python2 and Python3
- checks the PEP8 style
- updates README.md adds Travis badge

.travis.yml

@@ -0,0 +1,11 @@
+sudo: false
+
+language: python
+
+python:
+  - "2.7"
+  - "3.6"
+
+install: pip install tox-travis
+
+script: tox

README.rst

@@ -1,6 +1,9 @@
 Buildozer
 =========
 
+.. image:: https://travis-ci.com/kivy/buildozer.svg?branch=master
+       :target: https://travis-ci.com/kivy/buildozer
+
 Buildozer is a tool for creating application packages easily.
 
 The goal is to have one "buildozer.spec" file in your app directory, describing

tests/test_buildozer.py

@@ -0,0 +1,12 @@
+import unittest
+from buildozer import Buildozer
+
+
+class TestBuildozer(unittest.TestCase):
+
+    def test_buildozer_base(self):
+        """
+        Basic test making sure the Buildozer object can be instanciated.
+        """
+        buildozer = Buildozer()
+        self.assertEqual(buildozer.specfilename, 'buildozer.spec')

tox.ini

@@ -0,0 +1,16 @@
+[tox]
+envlist = pep8,py27,py36
+
+[testenv]
+commands =
+    python -m unittest discover --top-level-directory=. --start-directory=tests/
+
+[testenv:pep8]
+deps = flake8
+commands = flake8 buildozer/
+
+[flake8]
+ignore =
+    E121, E122, E123, E125, E126, E127, E128, E129, E131, E226, E231, E241,
+    E262, E265, E301, E302, E303, E305, E402, E501, E502, E722, E731, E741,
+    F401, F821, F841, W391, W504, W605