add layout: plain-markdown

useful for postprocessing with tools like pandoc (read: simple PDF output)

more info/usage in the sub-README
Change output filename to include original extension
Added OpenGL Shading Language(GLSL) to the language list
merged
Correct meta viewport content syntax

The viewport content value should be comma-delimited, and it should not
have a final semicolon.

Chrome 31 gives warning messages about the current implementation:

    The value "1.0;" for key "initial-scale" was truncated to its numeric prefix.
    The value "1.0;" for key "maximum-scale" was truncated to its numeric prefix.
    The value "0;" for key "user-scalable" was truncated to its numeric prefix.
    Error parsing a meta element's content: ';' is not a valid key-value pair separator. Please use ',' instead.

This change fixes all 4 of those warnings.

Alex Gibson covers the proper syntax in ["Make sure to use correct meta
viewport syntax"][1]

[1] http://alxgbsn.co.uk/2011/11/23/make-sure-to-use-correct-meta-viewport-syntax/
Fix CSS to match latest highlight.js release
Constrain dependency within major version, as recommended by semantic versioning
Found another issue: use of highlightjs.LANGUAGES
Merge pull request #259 from maxlinc/highlight_upgrade

Fix highlighting (broken for highlight.js >= 8.0.0)
add .npmignore to reduce npm package size
Merge pull request #264 from michaelficarra/npmignore

add .npmignore to reduce npm package size
Docco 0.6.3
Use first heading even if there is a line of code first

See issue #265.
Fix typo
Added scrolling support for the jump menu
Add ".cson" to languages
Added .ls livescript
Merge pull request #278 from homam/patch-1

Added .ls livescript
Merge pull request #274 from janraasch/patch-1

Add ".cson" to languages
Revert "Add ".cson" to languages"

This reverts commit cc016a06b18283788adb3662b21e855fd38a4b06.