Change generated class names: ELJ* -> wxRust*.

 * ELJ comes from ELJ project (http://elj.sourceforge.net/).
 * wxRust* is more friendly and intuitive name.
Merge 'rust-servo' into master: Change generated class names: ELJ* -> wxRust*.

 * ELJ comes from ELJ project (http://elj.sourceforge.net/).
 * wxRust* is more friendly and intuitive name.