Primitive text direction feature detector#5

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fedirnp wants to merge 5 commits intodchaplinsky:masterfrom fedirnp:master

+398

Commits on Sep 4, 2014

Text direction feature detector added
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Commits on Sep 5, 2014

More accurate results, returns "undefined" angle if not sure, fixes after review
fedirnp
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Commits on Sep 7, 2014

Improvements after review
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Commits on Sep 13, 2014

Speed improved 5x and few more corrections after review
fedirnp
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Commits on Oct 16, 2014

Magic values described, typos fixed, code linted
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