Edited the two contributing pages to ensure that they point readers towards site/docs for the docs rather than site/_posts (which doesn't exist)
Merge pull request #1214 from jadbirch/docs_correction

Very small documentation correction
Update history to reflect merge of #1214
Add ReadInXMinutes plugin
Merge pull request #1222 from zachleat/patch-1

Add ReadInXMinutes to plugin list
Update history to reflect merge of #1222
Remove plugins that have been obsoleted by changes in the core
Merge pull request #1223 from mojombo/remove-obsolete-plugins

Remove plugins that have been obsoleted by changes in the core
Update history to reflect merge of #1223
Adds jekyll-assets plugin link
Merge pull request #1225 from ixti/patch-1

Adds jekyll-assets plugin link
Update history to reflect merge of #1225
Removed the link that is now not working.
Add jekyll-pandoc-multiple-formats to plugins list
Merge pull request #1229 from edsl/add-plugin-pandoc-multiple-formats

Add jekyll-pandoc-multiple-formats to plugins list
Update history to reflect merge of #1229
Merge pull request #1227 from zachgersh/doc_update

Removed the link that is now not working to "Maintain your blog with git"
Update history to reflect merge of #1227