reword the install.md documentation page (refs #4723 refs #4644)
Better Cookie::$salt docs (refs #4723 refs #4644)
Fix documentation typo for Cookie::$salt docs (refs #4723 refs #4644)
refs #4723 - Chopping off bad practice example.

Zeelot: "The recommended way is to just build the full url from a route without recycling the one in Request.
you don't know which route the user got to your page with, trying to recycle parameters from it is asking for trouble"

So, removing the example...
Merge pull request #372 from maddes/patch-2

refs #4723 - Chopping off bad practice example.
Merge pull request #355 from kohana/feature/docs-revamp

Documentation Improvements