[NFR] Allow calling methods syntax in Volt

[mrspartak]

Volt template engine is really awesome! Thanks a lot guys!

But its too simle and gives too few advanteges to make some actions in template.
for example, we couldn't call predifinied functions or Models methods, to make something with data.

It would be very great if you add this feature.

Got it from your examples and converted to what it should be look like.

<? echo $products->getProductTypes()->name; ?>
{{ products.getProductTypes().name }}

[phalcon]

This syntax is now supported in 0.8.0, thanks