fixed example to check if the session exists when getting flash messages to avoid starting sessions when not needed
added doctrine tags to reference
Cleaned the FileSystem docs
Book/Controller : Minor tweak to gather 2 sentences

Factoring 2 sentences to make it easier to read.
Merge pull request #2591 from WouterJ/clean_filesystem_docs

Cleaned the FileSystem docs
Merge pull request #2597 from gregquat/patch-8

Book/Controller : Minor tweak to gather 2 sentences
Fix PHP syntax error in HttpKernel component working example

Extra comma after method argument removed.
the Filesystem component including a tagged API was added in Symfony 2.1
Merge pull request #2564 from fabpot/session

fixed example to check if the session exists when getting flash messages to avoid starting sessions when not needed
Merge pull request #2583 from pvolok/doctrine_tags

Added doctrine tags to the reference
[#2565] Fixing duplicate target "enabled"
Link to UserProviderInterface correction
Update target_path.rst

need this change for the 2.2.1 branch working
Merge pull request #2606 from xabbuh/issue2391

the Filesystem component including a tagged API was added in Symfony 2.1
Merge branch '2.0' into 2.1

Conflicts:
	reference/dic_tags.rst
Merge branch '2.1' into 2.2