GFM mode

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GitHub Flavored Markdown
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========================
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Everything from markdown plus GFM features:
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​
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## URL autolinking
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Underscores_are_allowed_between_words.
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## Strikethrough text
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GFM adds syntax to strikethrough text, which is missing from standard Markdown.
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~~Mistaken text.~~
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~~**works with other fomatting**~~
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​
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~~spans across
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lines~~
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## Fenced code blocks (and syntax highlighting)
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```javascript
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for (var i = 0; i < items.length; i++) {
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    console.log(items[i], i); // log them
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}
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```
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​
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## Task Lists
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- [ ] Incomplete task list item
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- [x] **Completed** task list item
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## A bit of GitHub spice
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* SHA: be6a8cc1c1ecfe9489fb51e4869af15a13fc2cd2
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* User@SHA ref: mojombo@be6a8cc1c1ecfe9489fb51e4869af15a13fc2cd2
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* User/Project@SHA: mojombo/god@be6a8cc1c1ecfe9489fb51e4869af15a13fc2cd2
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* \#Num: #1
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* User/#Num: mojombo#1
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* User/Project#Num: mojombo/god#1
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​
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See http://github.github.com/github-flavored-markdown/.
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​
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​

Optionally depends on other modes for properly highlighted code blocks.

Parsing/Highlighting Tests: normal, verbose.