feat(coding-style): Add editorconfig for consistent coding style

More info at http://editorconfig.org/

* The list of projects already using it to standardize their coding
styles[1].

* Inspired by editorconfig of django-model-utils[2].

[1]: http://git.io/pz1vWA
[2]: http://git.io/QIAWvw

.editorconfig

@@ -0,0 +1,17 @@
+# http://editorconfig.org
+
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.{py,rst,ini}]
+indent_style = space
+indent_size = 4
+
+[*.yml]
+indent_style = space
+indent_size = 2

{{cookiecutter.repo_name}}/.editorconfig

@@ -0,0 +1,17 @@
+# http://editorconfig.org
+
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.{py,rst,ini}]
+indent_style = space
+indent_size = 4
+
+[*.yml]
+indent_style = space
+indent_size = 2