add support for SDK versions#1

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evshiron wants to merge 7 commits intojontro:nwjs-13from

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Commits on Mar 25, 2016

add support for SDK versions
evshiron
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Commits on Mar 26, 2016

add support for NaCl versions
evshiron
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Commits on Apr 1, 2016

Update README with introduction and SDK example
evshiron
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Commits on Apr 21, 2016

fix missing libexif.dll issue on nw.js 0.14.1
evshiron
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Commits on Apr 22, 2016

Commits on May 13, 2016

update README
evshiron
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