Renamed AcmeHelloBundle to AppBundle
Moved templates to app/Resources/views
Fixed some other minor stuff
Updated to use AppBundle
Moved templates to app
Other fixes
Moved templates to app and controllers to AppBundle
Changed Bundle:Controller:Template to bundle:dir:file
Other random fixes
Use AppBundle
Some minor things
Used annotations for routing
Proofread routing article
Proofread templating
Fixed error
feature #4427 Update most important book articles to follow the best practices (WouterJ)

This PR was merged into the 2.3 branch.

Discussion
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Update most important book articles to follow the best practices

| Q   | A
| --- | ---
| Doc fix? | yes
| New docs? | no
| Applies to | all (or 2.6?)
| Fixed ticket | lots of complaints :)

I've decided to do only the most important articles for the first PR, otherwise the diff will be too big to get a nice review. I'll do a seperate PR for the Page Creation article, since that needed quite so rewriting.

Btw, I also couldn't resist to fix other minor things :)

Commits
-------

e56c272 Fixed error
9678b61 Proofread templating
51773f4 Proofread routing article
91c8981 Used annotations for routing
210bb4b Some minor things
4da1bcf Use AppBundle
10b3c7c Other random fixes
a8a75d7 Changed Bundle:Controller:Template to bundle:dir:file
db3086d Moved templates to app and controllers to AppBundle
ab2e2c7 Other fixes
18e3a31 Moved templates to app
c8f5ad5 Updated to use AppBundle
b735642 Fixed some other minor stuff
0ef1c68 Moved templates to app/Resources/views
87b324a Renamed AcmeHelloBundle to AppBundle