message: allow attributes in opening tag for 'at' and 'it' commands
diff: export class TagMatcher {
  - static TAG_REGEX = /\<(\/)?([^\>\<\s]+)\s*(\/?)\s*\>/g;
  + static TAG_REGEX = /\<(\/)?([^\>\<\s]+)[^\>\<]*(\/?)\>/g;
  static OPEN_FORWARD_SLASH = 1;
  static TAG_NAME = 2;
  static CLOSE_FORWARD_SLASH = 3;
  