add DeviceContext design doc#2648

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QiJune wants to merge 3 commits intoPaddlePaddle:developfrom

QiJune:feature/add_context

Commits on Jun 28, 2017

add context design doc
QiJune
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Commits on Jun 29, 2017

follow comments
QiJune
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Commits on Jul 3, 2017

follow comments, rename Context to DeviceContext
QiJune
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