[MenuBundle] Fix typo Persistant/Persistent

http://www.thefreedictionary.com/persistent
[MenuBundle] Fix typo "an class"

http://public.wsu.edu/~brians/errors/a.html
https://en.wikipedia.org/wiki/English_articles#Distinction_between_a_and_an
[RoutingAutoBundle] Fix "typo" in YAML example

All the other examples (XML and PHP) use `cmf_routing_auto.not_exists_action` so I guess it's just a copy-paste error...
Merge pull request #369 from lemoinem/patch-3

[MenuBundle] Fix typo "an class"
Merge pull request #368 from lemoinem/patch-2

[MenuBundle] Fix typo Persistant/Persistent
Merge pull request #370 from lemoinem/patch-4

[RoutingAutoBundle] Fix C/P error in YAML example
Merge remote-tracking branch 'origin/1.0'