Add links to Piwik Videos from inline help

There are a few videos explains how to use Piwik. These could be linked from the inline help:

Learn about your website visitors with Piwik http://www.youtube.com/watch?v=prCfmigaU18

Piwik's Actions Tab http://www.youtube.com/watch?v=rajy6Q-wpRA

Learn About Your Referrers with Piwik http://www.youtube.com/watch?v=HOpBWyeSbWc

Track your website's goals with Piwik http://www.youtube.com/watch?v=kQGSzxfStC4

Sending Email Reports with Piwik http://www.youtube.com/watch?v=p5nEggiWeXw

We should create pages on piwik.org for each of these videos so we dont link to youtube.com directly.

There are also other videos we could link to:

• Installing Piwik: http://www.youtube.com/watch?v=cUgYHF9uYNI&feature=plcp At the start of the installation process
• Piwik Settings: http://www.youtube.com/watch?v=9oHZYUIFTB8&feature=plcp When first loading the settings
• Introduction to Piwik: http://www.youtube.com/watch?v=xbpLvHrtLL0&feature=plcp

Related to #3229 Keywords: academy