Updated best practices for passing dependencies to presenters

I think it might be better if we stop recommending @inject annotation in presenters in favor of inject* methods and constructor. Related discussion is [here](http://forum.nette.org/cs/17817-jak-dostat-do-basecontrol-sluzbu-aniz-by-se-ji-museli-potomci-zabyvat) (in czech).

Also this is my first pull request ever, so please, be gentle if I did something wrong :-)