Add flake8, isort and ipython to the dev requirements file

{{cookiecutter.app_name}}/requirements/dev.txt

@@ -5,6 +5,18 @@
 pytest==2.8.2
 WebTest==2.0.20
 factory-boy==2.6.0
+ipdb==0.8.1
+ipython==4.0.0
 
 # Management script
 Flask-Script==2.0.5
+
+# Lint and code style
+flake8==2.5.0
+flake8-blind-except==0.1.0
+flake8-debugger==1.4.0
+flake8-docstrings==0.2.1.post1
+flake8-isort==0.2
+flake8-quotes==0.1.1
+isort==4.2.2
+pep8-naming==0.3.3