Add EditorConfig for spacing

EditorConfig supports multiple IDEs to enforce spacing guidelines
http://editorconfig.org/
Fix spacing in README
Fix spacing in Combinator.js
Fix spacing in MediaFeature.js
Fix spacing in MediaQuery.js
Fix spacing in PropertyName.js
Fix spacing in PropertyValue.js
Fix spacing in PropertyValueIterator.js
Fix spacing in PropertyValuePart.js
Fix spacing in Selector.js
Fix spacing in SelectorPart.js
Fix spacing in SelectorSubPart.js
Fix spacing in Specificity.js
Fix spacing in TokenStream.js
Fix spacing in Validation.js
Fix spacing in ValidationTypes.js
Fix spacing in EventTarget.js
Fix spacing in SyntaxUnit.js
Fix spacing in TokenStreamBase.js
Fix spacing in CSSSpecifityTests.htm