[Console] fixed progress bar jumping
Issue 5288 fix 
[Routing] removed tree structure from RouteCollection
adjusted tests
added upgrade instructions
updated CHANGELOG for 2.0.19
update CONTRIBUTORS for 2.0.19
updated VERSION for 2.0.19
updated CHANGELOG for 2.1.4
updated VERSION for 2.1.4
[HttpKernel] Add DI extension configs as ressources when possible
Bugfix for creating cookie on loginSuccess in AbstractRememberMeServices
Fix problem when 1 column identifier in propel is a string.

The ModelChoiceList thinks it can be used as the index of the ChoiceList, when it can only be used if it is an integer.
[HttpFoundation] added a small comment about the meaning of Request::hasSession() as this is a recurrent question (refs #4541)
[HttpFoundation] Request::getRealMethod() now returns UPPERCASE
merged branch vicb/realfix (PR #6160)

This PR was merged into the master branch.

Commits
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bad50ac [HttpFoundation] Request::getRealMethod() now returns UPPERCASE

Discussion
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[HttpFoundation] Request::getRealMethod() now returns UPPERCASE
removed unused attribute from routing.xsd
it should be possible to define the defaults, req. and options in any order, just like in YAML
refactor to an xsd:group
make id attribute required