Use valid css class names when pygments language contains invalid chars, eg html+jango
Add table_prefix option for jekyll-importer

Add table_prefix to use with WordPress and Joomla importers so they can modify the default value.
Sort plugins so people can have "load orders".

This allows for people to do something like "_plugins/1-autoload-global.rb" and have it load first and so on making it much easier to organize code and have a "header file" that does all the requiring up front if it's needed for all plugins.
Extract Site#filter_entries into its own class
Use the new `EntryFilter` class in `Site`
A start at a gem-based plugin whitelist for Pages.
Add --whitelist flag and internal logic
Remove Site.whitelist attribute.
Merge pull request #1697 from mojombo/entry-filter-method-object

Extract `Site#filter_entries` into a method object
Update history to reflect merge of #1697
Use prefix instead of table_prefix.
Fix link to previous section

There's no `assets` section. Linking to `pagination` instead.
Add Emoji for Jekyll to plugin list.
Merge pull request #1708 from yihangho/add-emoji-plugin

Add Emoji for Jekyll to plugin list.
Update history to reflect merge of #1708
Merge pull request #1707 from localheinz/patch-1

Fix link to previous section
Update history to reflect merge of #1707
Link to an org-mode converter for Jekyll
Merge pull request #1711 from abhiyerra/org-mode-converter-link

Link to an org-mode converter for Jekyll
Update history to reflect merge of #1711