Gregwar/Captcha dependency#20

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lokeoke wants to merge 3 commits intoM1r1k:8.0.xfrom

Commits on Nov 2, 2014

In _captcha_get_captcha_placement return empty array instead of null
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Merge branch '8.0.x' of https://github.com/M1r1k/captcha into 8.0.x
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Commits on Nov 3, 2014

Update readme.md, example composer.json, .travis.yml has gregwar/captcha dependency
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