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mkdown.el --- Pretty Markdown previews based on mkdown.com

Summary:
A small library that improves the look of Markdown previews from
Emacs, using the style of [mkdown.com][].

Screenshots:

Before:

![](https://photos-6.dropbox.com/t/0/AACRSyhnUc2-ol22-MqpsgEWXc28IrTNXTHQ7cgyFfp2uQ/12/13107408/png/2048x1536/3/1400328000/0/2/Screenshot%202014-05-17%2011.37.41.png/z_J6k7cJlYY_OwJdKekPxFCKjfytPCeQapp59vsI_qw)

After:

![](https://photos-4.dropbox.com/t/0/AABxBrMin-mORIH6je3ya9eaPMPAKoZeJW9i2xhvdr3CwQ/12/13107408/png/2048x1536/3/1400328000/0/2/Screenshot%202014-05-17%2011.38.00.png/jzj4zakYECArIdjZtBlcSNfro45h9icsri51T5fP-sk)

Test Plan:
`make recipes/mkdown` passes.

Use to generate screenshots above.

Reviewers:

CC:
Add a package recipe for .gold files
Add nix-mode recipe
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Add quack
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Merge pull request #1751 from dougm/nix-mode

Add nix-mode recipe
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Add a package recipe for .gold files
Merge pull request #1752 from danlamanna/master

Add i2b2-mode
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Add quack
add scad-mode (from OpenSCAD) recipe
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add scad-mode recipe
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Add smart-shift-mode recipe
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