[web2py] the ability to pass li class form response.menu could be useful with bootstrap

[Richard]

Hello,

Here html example of menu with bootstrap :

<div class="nav-collapse">
            <ul class="nav">
              *<li class="divider-vertical"></li>*
              *<li class="active">*<a href="#"><i class="icon-home"></i> 
Accueil</a>*</li>*
              
              <ul class="nav">

I found it very difficult to generate menu with the li in bold in the 
example above with MENU and response.menu, since li_class doesn't allow 
enough flexibility.

I don't think we can pass _class attribute in reponse.menu tuple, but it 
could help a lot in order to allow greater flexibility in the usage and 
integration with bootstrap.

Richard

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