Add Twitter Cards

Added to the Semantics section, not sure if that is the best fit or not.
Added Open Graph protocol

Added to the Semantics section, not sure if that is the best fit. I think a Social Media section might make sense at this point.
Added Facebook Insights to Traffic analysis

Facebook Insights provides a traffic analysis dashboard for domain links shared on Facebook.
resolving merge conflict
Merge branch 'patch-3' of https://github.com/jpoehls/webdevchecklist.com
Creating Social Media section
Updating demo. Closed # 33
Added Social Media category
Changed Favicon Generator Link

I used this site to generate the favicon for webdevchecklist.com. The
previous one (dynamicdrive) butchered the image and only included 2
sizes. X-Icon-Editor does 4. See the discussion at: http://www.jonathantneal.com/blog/understand-the-favicon/ for more information.
Updated Favicon

Updated the default favicon. Added Windows 8 Tile Icon and iOS Home Page
icons.