[Security] add an AbstractVoter implementation#11183

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inoryy wants to merge 3 commits intosymfony:masterfrom

inoryy:abstract-voter

Commits on Sep 23, 2014

add abstract voter implementation, reducing boilerplate required for custom voter
inoryy
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update AbstractVoter: vote returns as soon as access is granted; improve/update API based on PR comments
inoryy
committed
add AbstractVoter tests; add licensing information
inoryy
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