Referenced oldest but still maintained version in contributing documentation.
Added documentation about profiler matchers
Removed duplicated stuff
Added docs about immutable dispatcher
Documented htmlPattern option
Unified autoloading
gc_maxlifetime default value

The correct value of parameter gc_maxlifetime is not 14400 but 1440.
Merge pull request #2880 from petajaros/patch-1

gc_maxlifetime default value
The use of the undefined variable $router is confusing if you jump straight to http://symfony.com/doc/current/book/routing.html#generating-absolute-urls in the docs (as I did.)
[#2854] Fixing small bug thanks to @xabbuh
[#2854] One more small fix thanks to @xabbuh
Merge branch 'issue_2104' of github.com:WouterJ/symfony-docs into WouterJ-issue_2104

Conflicts:
	book/internals.rst
[#2785] Minor tweaks to new profiler matchers docs
[#2855] Trying to make the .first and .second sub-field names a bit more clear
Merge pull request #2859 from dosten/reference_stable_version

Referenced oldest but still maintained version in contributing documenta...
Merge pull request #2863 from WouterJ/issue_2858

Added docs about immutable dispatcher
[#2863] Fixing some ordering of documents
Merge pull request #2864 from WouterJ/issue_2833

Documented htmlPattern option
[#2864] Small tweaks thanks to @xabbuh on new Regex:htmlPattern option docs
Merge pull request #2867 from WouterJ/issue_2331

Unified autoloading in Sf2 <> Sf1 article