started page per speaker
better layout for speaker site
adds the dummy images only one time
adds sessions to speaker
adds links to sessions and session to speaker, missing layout for session in speaker
fixes wrong speaker in session
Optimize layout of speaker site
"speaker" => "speakers", follow naming conventions (no cases in urls/htmls)
Make it easier to understand items are clickable
Add session color agenda
Improve highlight of sessions on hover
Update feature/site_per_speaker from master

Conflicts:
	js/devfest_berlin.js
Merge pull request #10 from devfest-berlin/feature/site_per_speaker

Introduce speaker detail page by @alosdev