Make funcparserlib imports more compact

```
For example, instead of:

    from funcparserlib.lexer import make_tokenizer, Token
    from funcparserlib.parser import tok, many, fwd

allow this:

    from funcparserlib import make_tokenizer, Token, tok, many, fwd

```

Original issue reported on code.google.com by `andrey.vlasovskikh` on 26 May 2011 at 11:19
