[Console] Define isVerbose(), etc. methods in OutputInterface#13086

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frne wants to merge 2 commits intosymfony:masterfrom

frne:output-verbosity-methods-in-interface

Commits on Dec 23, 2014

Added isVerbose(), isVeryVerbose(), isQuiet() and isDebug() methods to OutputInterface
frne
committed

Commits on Jan 3, 2015

Removed api annotations
frne
committed