feat: add editorconfig, tox, and flake8

Author: devshawn

Diff for: .editorconfig

@@ -0,0 +1,15 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[{*.py, *.json}]
+indent_style = space
+indent_size = 4
+
+[*.yaml]
+indent_style = space
+indent_size = 2

Diff for: .flake8

@@ -0,0 +1 @@
+select = Q0

Diff for: tox.ini

@@ -0,0 +1,18 @@
+[tox]
+envlist = py27,py35,py36,py37
+
+[testenv]
+deps =
+    pytest
+    mock
+    prompt_toolkit
+    fuzzyfinder
+    pygments
+    flake8
+    flake8-quotes
+    pexpect
+    jsonschema
+    oyaml
+commands =
+    flake8 --max-line-length=120 --inline-quotes '"' --exclude=.tox,.git,htmlcov,build,dist,tests,docs,venv .
+    pytest