Not working for custom symbols

[upmauro]

Directive not working when use custom angular

app.config(function($interpolateProvider, $httpProvider) {
        $interpolateProvider.startSymbol('[[');
        $interpolateProvider.endSymbol(']]');
    });

This is necessary because i'm using Django and the template engine uses the same symbols of angular {{ and }}.

I will try send PR later.

Thanks.