add footer_insert
update README
Correct list and code samples formatting
Added b64img liquid_tag
Merge pull request #278 from liob/pandoc_reader

Add pandoc_reader plugin as a submodule
FIX: Sitemap offset-naive datetimes(modified) error
Added files for new Video Privacy Enhancer Pelican plugin.
Added files for new Codeblock Line Numbering Pelican plugin.
Merge pull request #311 from zhangliyong/master

FIX: Sitemap offset-naive datetimes(modified) error
Merge pull request #216 from publicus/youtube_privacy_enhancer_plugin_development

Added files for new Youtube Privacy Enhancer Pelican plugin.
Merge pull request #217 from publicus/better_codeblock_line_numbering_development

Add files for new Codeblock Line Numbering Pelican plugin.
Render_math now working with markdown versions >= 2.5
fix sort_tags
fix bootstrapify
Merge pull request #316 from ingwinlu/fix_sort_tags

fix sort_tags and bootstrapify
Merge pull request #313 from barrysteyn/render_math

Render_math now working with markdown versions >= 2.5
Merge pull request #302 from helb/patch-1

Correct list and code samples formatting
Two new plugins: pelican-jinja2content and pelican-md-yaml
update README.
Fix feed_summary plugin for python3.