Merge pull request #515 from Qwinix/master

Added 5 new speakers + updated Keiji Yoshida's profile + twitter link
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Merge pull request #516 from SatishTalim/master

commit - minor
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Merge pull request #517 from SatishTalim/master

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Merge pull request #518 from SatishTalim/master

commit - minor
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Merge pull request #521 from SatishTalim/master

commit - minor
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Merge pull request #523 from SatishTalim/master

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Merge pull request #525 from SatishTalim/master

commit - blog post
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Merge pull request #526 from SatishTalim/master

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Merge pull request #527 from SatishTalim/master

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Add Khosrow Afroozeh as a Speaker #326
Merge pull request #329 from Qwinix/issue_326

Add Khosrow Afroozeh as a Speaker #326
Merge pull request #330 from Qwinix/master

Add Khosrow Afroozeh as a Speaker #326