Add travis ci

.flake8

@@ -0,0 +1,5 @@
+[flake8]
+max-line-length=99
+exclude=.git
+select=E,W,F,C,N
+ignore=

.travis.yml

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+language: python
+
+python:
+      - "3.4"
+      - "3.5"
+      - "3.5-dev"
+      - "3.6"
+      - "3.6-dev"
+      - "nightly" # currently points to 3.7-dev
+install:
+    - "pip install --editable .[dev]"
+    - "pip install -r requirements-test.txt"
+    - "pip install python-coveralls"
+script:
+    - "pytest -v  --cov-report= --cov=quaternions tests/"
+after_script:
+    - "flake8 quaternions"
+
+# report coverage to coveralls.io
+after_success:
+    - coveralls
+
+cache:
+  apt: true
+  pip: true

README.md

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 Quaternions library
 ===================
 
+[![Coverage Status](https://coveralls.io/repos/github/satellogic/quaternions/badge.svg)](https://coveralls.io/github/satellogic/quaternions)
+[![Build Status](https://travis-ci.org/satellogic/quaternions.svg?branch=add_travis_ci)](https://travis-ci.org/satellogic/quaternions)
+
 This is a library for dealing with quaternions in python in a unified way.
 
 To install it:

requirements-test.txt

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+hypothesis
+pytest 
+pytest-coverage
+flake8>=2.5.4

requirements.txt

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 numpy
-hypothesis