Organize plugins into categories, clean up copy.
Escape/remove single '_' and '*'s that maruku chokes on.
Pages are not alphabetical.

https://github.com/mojombo/jekyll/commit/f25fe1c86fd6d9fb05f23222711e3678d4453371#commitcomment-3644377
Update history to reflect removal of erroneous statement in docs about site.pages' sorting.
Update Extras page in the docs to include Kramdown to fix #1313
Add brackets around sudo on Extras page
Change syntax highlighting to YAML on Extras page
Add description for drafts folder. Fix #1319
Merge pull request #1320 from penibelst/patch-1

Add description for drafts folder. Fix #1319
Update history to reflect merge of #1320
Merge pull request #1310 from robwierzbowski/organize-plugins

Organize plugins into categories.
Update history to reflect merge of #1310
Remove superfluous 'table' selector from main.css in 'jekyll new' site template.
Closes #1323
Merge pull request #1328 from mojombo/remove_table_selector

Remove superfluous 'table' selector from main.css in 'jekyll new' site template
Add generator-jekyllrb and grunt-jekyll to plugins page
Merge pull request #1330 from robwierzbowski/add-grunt-yeoman

Add generator-jekyllrb and grunt-jekyll to plugins page
Update history to reflect merge of #1328
Update history to reflect merge of #1330
Merge pull request #1318 from johnkhughes/master

Update Extras page in the docs
Update history to reflect merge of #1318