Some formatting and spelling enhancements.

Make links from footnotes and add missing URL
for [2], guessing the right URL.

Change spelling and Umlauts.

Add some formatting.

Signed-off-by: Thomas Hochstein <thh@inter.net>
Update Planet
Add audio links
Neuer Event für den Vortrag November 2014
Update Twitter
Merge pull request #16 from Stefan-/patch-2

Neuer Event für den Vortrag November 2014
Fix yaml
Merge pull request #15 from th-h/thh-201408

Some corrections and enhancements for August event.
Add 31c3
Update Twitter
Update Twitter