Add requirements.txt for easy installation of dependencies, and a tox file

requirements.txt

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+git+https://msdl.uantwerpen.be/git/simon/SCCD.git#subdirectory=src
+pytest

tox.ini

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+# tox (https://tox.readthedocs.io/) is a tool for running tests
+# in multiple virtualenvs. This configuration file will run the
+# test suite on all supported python versions. To use it, "pip install tox"
+# and then run "tox" from this directory.
+
+[tox]
+envlist = py27, py35, pypy
+skipsdist = True
+
+[testenv]
+skip_install = True
+deps = -rrequirements.txt
+commands =
+    {envpython} scripts/run_tests.py