Provide profiling tools

[ymeine]

As for any product, I think code profiling should be put in place.

I've done some researches and profiling node programs is not so easy 😕

Here are a few solutions I found:

• node-webkit-agent seems to be the perfect thing, it's like node-inspector but for profiling. Except that I couldn't install it on my machine.
• nodetime apparently actually does some CPU profiling. I didn't try it directly but through look
• the basic v8 option: node --prof script. It produces a log file that can be inspected with some tools, but there are some issues with those

Maybe the basic v8 profiling option is enough, but we need to find something to interpret it.

Otherwise, keep in mind that the idea is to have automatic profiling: no modification of the code!

[ymeine]

Implementing #41 would fix this issue for the editor module at least (the most important one): browsers contain profiling tools.