Document how to override log/cache dir and charset

[fabpot]

We should document how someone can override the default cache dir, log dir, and charset. Answer: by creating a getLogDir(), getCacheDir, and getCharset method in the AppKernel class.

[wouterj]

I doubt where this documentation should go. I think creating a new tutorial on cookbook/configuration is overdone, but I don't see any other location for this (maybe in the Reference?)

[dlondero]

Without creating a new tutorial I think the better place to put this piece of documentation is in "Installing and Configuring Symfony" chapter, just after the directory structure example. It would be nice to say "hey this is the common directory structure but if you need a custom structure you can do something...".

[wouterj]

@dlondero yes, that is a better place I think. And I think in a sidebare is the best option. I am going to try to write something about this.

[Sgoettschkes]

The PR #1678 fixes this issue and it should be closed @weaverryan

[wouterj]

@Sgoettschkes it is not complete yet. We should document how to override the charset somewhere (not in that cookbook article) and we should change the cookbook article for 2.1 (composer needs some changes).