Merge branch 'master' into coding/typing_and_pep8

.coveragerc

 [run]
 source = tracim
 omit = tracim/test*
+
+[report]
+omit = tests/*

.travis.yml

+sudo: false
+language: python
+python:
+  - "3.4"
+  - "3.5"
+  - "3.6"
+
+install:
+  - pip install --upgrade pip setuptools
+  - pip install -e ".[testing]"
+  - pip install pytest-cov
+  - pip install python-coveralls
+
+script:
+ - py.test --cov tracim
+
+after_success:
+  - coveralls

README.txt

 - Run pep8 checks
 
     pep8 tracim
+
+CI
+---
+
+* Code quality: https://scrutinizer-ci.com/g/tracim/tracim_backend/
+* Test validation: https://travis-ci.org/tracim/tracim_backend
+* Code coverage: https://coveralls.io/github/tracim/tracim_backend

setup.py

 import os
 
+import sys
 from setuptools import setup, find_packages
 
 here = os.path.abspath(os.path.dirname(__file__))
     'mypy',
 ]
 
+# Python version adaptations
+if sys.version_info < (3, 5):
+    requires.append('typing')
+
+
 setup(
     name='tracim',
     version='0.0',