1. Replaced contributing.html page with contrib/ directory containing separate pages for different ways to contribute.
2. Fixed references to contributing.html.
3. Added main menu pulldown for different ways to contribute.
Blog post about GitHub, CSV files, and platforms
Adding links to blog post
Adding a link to Steve Yegge's rant
INTECOL13 blog post
Fixed two typos
1. Rewriting guide to creating exercises and examples based on feedback from @pipitone.
2. Updating description in home page of what we need.
3. Adding definition to standard configuration YAML for swcarpentry.github.io (rendered pages).
Merge branch 'getting-involved'
Small changes to wording on index page for contributions
Stats on instructor training
Final tweaks
Merge branch 'two-cheers-for-github'
Fixing typo
Merge pull request #95 from mikej888/intecolblog

INTECOL13 blog post
Fixing HTML formatting in blog posts
Removing double colons from mailto links
Added link to registration page.
Merge pull request #97 from amyrbrown/uw-reg-link

Added link to registration page.