highlight active menu element.
Added new layout. More responsive.
Remove Propel 1.x doc
Import new Propel documentation
Merge branch 'master' of https://github.com/marcj/propelorm.github.com into propel2
highlight active menu element.
Added new layout. Html5, more responsive and prettier.
Bring back documentation on Silex

Commit 1d891f0cb7b didn't ship with the Silex documentation and it has
never been pulled in the repository so this commit bring it back.

The guide is based on the PropelServiceProvider repository's README
file which is up to date.
Move the insert part to the bottom of the build guide

In the buildtime guide, the insert process is explained before the
necessary stuff is set up so the user can't get the schema inserted in
the database.
Add whats new file, describing how to migrate from Propel1 to Propel2
Merge pull request #241 from cristianoc72/propel2

Add `What's new` file
Remove the Symfony2 documentation

As of today, the PropelBundle is not up to date to provide Propel 2 in a
Symfony application so let's remove the doc for now.

Feel free to revert it once the bundle will be ready for this version.
Added back missing links on the index documents

Added back links which weren't backported (e.g. Silex cookbook)
Move each chapter to match its number

Since the validators chapter has been removed, all the previous chapter
numbers don't match their order.
Put behaviors' provided methods into lists
Minor fixes
no more pear
Add banner
Reintroduce post layout
responsive banner