readd example scripts env to tox

Author: Manuel

tox.ini

@@ -1,21 +1,21 @@
 [tox]
-envlist=py35,py36,py37,coverage,docu
+envlist=py35,py36,py37,coverage,docu,example_scripts
 
 [testenv]
-deps = 
+deps =
   -Ur{toxinidir}/requirements.txt
-commands = 
+commands =
     nosetests
 
 [testenv:docu]
-deps = 
+deps =
   -Ur{toxinidir}/docs/requirements.txt
 changedir = {toxinidir}/docs
-commands = 
+commands =
     sphinx-build source build
 
 [testenv:coverage]
-passenv = 
+passenv =
   CI TRAVIS TRAVIS_*
 deps =
   numpy
@@ -26,3 +26,12 @@ commands =
   coverage run {envbindir}/nosetests
   coverage report --include=ursgal/* --omit=test/
   codecov
+
+[testenv:example_scripts]
+deps =
+  -Ur{toxinidir}/requirements.txt
+changedir = {toxinidir}/example_scripts
+commands =
+    # selected example_scripts here
+    python filter_csv_validation_example.py
+    python filter_csv_for_mods_example.py