Feature/profile templates rendering

In some projects is very easy to have many templates which contains quite a lot of "logic" (although often is just service calls orchestration), specially when using the fields plugin (I find it one of the most powerful ones, specially for backoffices).

I added templates rendering profiling (aka the g.render/<g:render> calls) by overriding default render taglib. I updated the 2.2.x demo with a controller method that invokes a template. I intended to update the 1.3.x example as well, but I couldn't make it work even in a clean branch (attached is an image of what I obtain... It appears the logExit is not reached in the view filter).

![screen shot 2014-01-26 at 8 23 59 pm](https://f.cloud.github.com/assets/864302/2004746/751d1b4a-86bf-11e3-8ae0-ac440e3dbf58.png)

If you guys think is better to create a plugin that depends on this one instead of adding this to the original one, just let me know.