Add .editorconfig file

Author: DustinCampbell

.editorconfig

@@ -0,0 +1,15 @@
+# EditorConfig is awesome: http://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+# 4 space indentation
+[*]
+indent_style = space
+indent_size = 4
+trim_trailing_whitespace = true
+
+# 2 space indentation for .travis.yml and package.json
+[{.travis.yml},package.json]
+indent_style = space
+indent_size = 2