Documented the new label_format option#4412

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javiereguiluz wants to merge 5 commits intosymfony:masterfrom

javiereguiluz:add_label_format_option

Commits on Nov 2, 2014

Commits on Nov 3, 2014

Commits on Nov 11, 2014

Reverted an accidental change in the subproject commit
javiereguiluz
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