JavaScript target is broken in the latest (v3.5) release

If you try to compile any grammar for tests directory, say `t001lexer.g`

```
lexer grammar t001lexer;
options {
language = JavaScript;
}

ZERO: '0';
```

you'll get a bunch of errors including:

```
error(24): template error: JavaScript.stg 27:6: required parameters (filterMode) must appear before optional parameters
```

Which is expected because of

```
lexer(grammar, name, tokens, scopes, rules, numRules, labelType="Token",
filterMode, superClass="org.antlr.runtime.Lexer") ::= <<
```

in `JavaScript.stg`

Reproducible in linux and windows using `OpenJDK v 1.6.0_20` and `JRE 1.7.0_21` correspondingly

The actual result: nothing is generated

The expected result: the `.js` and `.tokens` files to be generated

Start by reproducing the failure with tests/t001lexer.g and inspect JavaScript.stg, especially the lexer template around line 27. Run the grammar compilation and confirm that the fix produces both the .js and .tokens files without template errors.

Written by the indexing model from the issue text.