Adding a small document on the changes related to trusting proxy data
Fixed typo, closes #2132
Merge pull request #2133 from WouterJ/patch-4

Fixed typo
Update cookbook/form/form_collections.rst
Add deprecations to PR summary
Merge branch '2.0' into 2.1
tweaked the PR check-list to make it more readable
added a shorter version of the todo list for minor changes
added more information about how to document BC breaks and deprecations
added more hints about the goals of the check-list
Fixed list of methods of the filesystem component
[#2128] Fixes per @WouterJ's suggestions
Merge pull request #2128 from symfony/trusting-proxies

Adding a small document on the changes related to trusting proxy data
Merge pull request #2137 from fabpot/contrib-updates

Tweak the PR check-list and add more information about how to contribute
Merge branch '2.0' into 2.1

Conflicts:
	components/http_foundation/index.rst
	components/map.rst.inc
	contributing/code/patches.rst
Merge branch '2.1'