Document new progressbar methods#4655

Merged

weaverryan merged 2 commits intosymfony:2.6from

javiereguiluz:document_new_progressbar_methods

Dec 22, 2014

Commits on Dec 15, 2014

Documented getProgress/setProgress methods
javiereguiluz
committed

Commits on Dec 16, 2014

Changed the "new in Symfony 2.6" message for consistency
javiereguiluz
committed