Activate flake8, isort and coveralls in the configuration of tox (#105)

* Activate flake8, isort and coveralls in the configuration of tox

* Update code to respect PEP8

* Fix bug in the lang_IT for python 3

* Update the README to include the new converters.

tox.ini

@@ -2,18 +2,14 @@
 envlist = flake8, isort, py27,py34,py35,py36
 
 [testenv]
+passenv = TRAVIS TRAVIS_*
 deps =
     -r{toxinidir}/requirements-test.txt
 commands =
+    flake8
+    isort --check-only --recursive --diff num2words tests
     coverage erase
     coverage run -m unittest discover
     coverage report --fail-under=75 --omit=.tox/*,/usr/*
-
-[testenv:flake8]
-commands=
-    flake8
-
-[testenv:isort]
-commands=
-    isort --check-only --recursive --diff num2words tests
+    coveralls