added .editorconfig

.editorconfig

@@ -0,0 +1,26 @@
+; EditorConfig is awesome: http://EditorConfig.org
+
+; top-most EditorConfig file
+root = true
+
+; Unix-style newlines with a newline ending every file
+[*]
+; end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+; 4 space indentation
+[*.py]
+indent_style = space
+indent_size = 4
+
+; Tab indentation (no size specified)
+[*.js]
+; indent_style = tab
+indent_style = space
+indent_size = 4
+
+; Indentation override for all JS under lib directory
+[lib/**.js]
+indent_style = space
+indent_size = 2