minor #30 Moved the rest of the book chapters (javiereguiluz)

This PR was squashed before being merged into the 2.7 branch (closes #30).

Discussion
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Moved the rest of the book chapters

* `book/` directory is GONE
* Leftover chapters moved as tutorials (I've maintained the original file names, but in the next days we'll update them to avoid idiotic paths such as `/propel/propel`, `/performance/performance`, etc.

Commits
-------

7963397 Moved the rest of the book chapters

Author: javiereguiluz

book/index.rst

@@ -77,3 +77,8 @@
 /book/http_cache /http_cache
 /book/translation /translation
 /book/service_container /service_container
+/book/http_fundamentals /http_fundamentals
+/book/from_flat_php_to_symfony2 /introduction/from_flat_php_to_symfony2
+/book/configuration /configuration/configuration
+/book/propel /propel/propel
+/book/performance /performance/performance

book/map.rst.inc

@@ -105,7 +105,7 @@ for you. In order for this to work, you must *teach* the container how to
 create the ``Mailer`` service. This is done via configuration, which can
 be specified in YAML, XML or PHP:
 
-.. include:: includes/_service_container_my_mailer.rst.inc
+.. include:: includes/service_container/_my_mailer.rst.inc
 
 .. note::
 
@@ -581,7 +581,7 @@ which has a ``getMailerMethod()`` method on it, which will return a string
 like ``sendmail`` based on some configuration. Remember that the first argument
 to the ``my_mailer`` service is the simple string ``sendmail``:
 
-.. include:: includes/_service_container_my_mailer.rst.inc
+.. include:: includes/service_container/_my_mailer.rst.inc
 
 But instead of hardcoding this, how could we get this value from the ``getMailerMethod()``
 of the new ``mailer_configuration`` service? One way is to use an expression: