first pass at /community guidelines
Create 2013-10-17-xas-software

Create a _post for the Demeter package of software for XAS data analysis and processing, a project from a physicist at the United States' National Institute of Standards and Technology.
make .md extension on _post
trivial spelling correction
added some links to NIST
improve instructions for adding institutions

via https://github.com/github/government.github.com/pull/74/files#r7017437
small edits
typo
Add IATI to organizations list
Fixing instructions, part deux
Update community.md
Fix heroku hyperlink
limit image height on single posts
Update readme.md.
Added Code for Africa

http://www.codeforafrica.org
Merge pull request #209 from CodeForAfrica/gh-pages

Added Code for Africa
Merge pull request #198 from github/image-height

limit image height on single posts
Merge branch 'prose-patch-1' of https://github.com/sebasmagri/government.github.com into sebasmagri-prose-patch-1
typo #194
Remove unused IDs.