Adds some regex to the image filter to make sure we don't transform things that are already img tags.

Helpful when using redcarpet in front of the image filter.
Makes sure the twitter filter doesn't format already formatted Twitter blockquotes.

Also adds unit tests for Twitter.
Deferred loading of filters dependencies when possible
Merge branch 'dont_transform_img_tags' of git://github.com/n8/auto_html into n8-dont_transform_img_tags

Conflicts:
	lib/auto_html/filters/image.rb
update Changelog
Merge branch 'dont_format_already_formatted_twitter_blocks' of git://github.com/n8/auto_html into dont_format_already_formatted_twitter_blocks
remove speakerdeck since it's not working
remove GoogleVideo: it's discontinued
Deprecate GoogleVideo, don't remove it, we don't want to break apps
version bump
Added filter for TED talks, along with tests.
Merge branch 'add_ted_talks_filter'
Merge pull request #93 from brettfishman/master

Added TED filter
Merge branch 'master' of git://github.com/tanraya/auto_html into tanraya-master

Conflicts:
	lib/auto_html/filters/link.rb
	lib/auto_html/filters/soundcloud.rb
	lib/auto_html/filters/twitter.rb
Merge branch 'master' of github.com:dejan/auto_html
update changelog
upgrading redcarpet