assemblymade/coderwall — pull request #251 by codebender (2014-11-28 06:30:08+00:00)
Title: contributing.md doc love

[Touch up CONTRIBUTING.md - Bounty - 431](https://assembly.com/coderwall/bounties/431)
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- link to download VirtualBox 4.3.20 needs to be updated
- fix/update broken image oh how to download binaries and extensions
- update reference to coderwall_v3