Merge pull request #92 from tonini/master

no need to be version specific in docs lookup anymore.
use latest stable branch
D_controllers amendments
Merge pull request #93 from webengineer/D_controllers-overriding-rendering-formats

D_controllers amendments
lots of rework/rewording to reflect current Phoenix code
Merge pull request #94 from lancehalvorsen/further-refurbish-router-guide

lots of rework/rewording to reflect current Phoenix code
typo from phoenixframework.org
typo from phoenixframework.org