Add brief explanations to each vulnerability#1

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thesubtlety wants to merge 10 commits intoopendns:masterfrom

thesubtlety:master

Commits on Jul 9, 2015

add explanation for a1.html
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add explanation for a2
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add explanations for a3
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Commits on Jul 10, 2015

add explanations for a5 and update previous
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add explanations for a6
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add explanations for a7
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Commits on Aug 5, 2015

add explanations for a8
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add explanations for a10
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add explanations for a9
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update line endings to Windows
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