* igorw/more-docs:
  [docs] a section about common pitfalls
  [docs] style adjustment
  [docs] emphasis on "let's go"
  [docs] explain the purpose of the JsonUserPersister
  [docs] add cross-references to Symfony2 API docs
  [docs] several small adjustments

* igorw/httpexception:
  rename BaseHttpException to HttpException

Dashes are common in URL patterns, so it would be helpful to convert them to underscores for default route generation. Any invalid characters (according to Symfony\Component\Routing\RouteCollection) should be stripped entirely, lest an exception is raised.

If a route ends with a / and the user forgets the / (and a similar route without a / does not exist),
then, the user will be redirected to the real URL:

If you have a /doc/ URL pattern, a request to /doc will redirect you to /doc/

This is especially useful for the root URL (/):

/index.php (which does not make sense as the path info is / at a minimum)
redirects to /index.php/

* igorw/docs:
  [docs] note that twig is not included
  [docs] add Extension suffix to extension titles
  [docs] some documentation for the UrlGeneratorExtension
  [docs] better examples for the extensions chapter
  [docs] remove reference to symfony_bridges in TwigExtension docs
  [docs] move extension documentation to sub-directory
  [docs] remove _exts
  [docs] more on routes and twig
  [docs] initial documentation draft

note: only twig and monolog extensions have been documented so far

* igorw/extension-tests:
  [UrlGeneratorExtension] initial test case
  [SessionExtension] initial test case
  [TwigExtension] initial test case