* Linkbot parser also looks for <meta> tags and uses an actual HTML
parser.
* Inner title HTML is decoded before being displayed.
Signed-off-by: Alek Ratzloff <alekratz@gmail.com>
This is beneficial for all plugins so the bot doesn't accidentally
spam things because the plugin writer didn't check their inputs
Signed-off-by: Alek Ratzloff <alekratz@gmail.com>