added all talks March-September 2013
Merge pull request #13 from glaubinix/talks-march-september

added all talks March-September 2013
replaced the jquery twitter plugin with an embedded timeline
hopefully removed all the code from the old implementation

missing the widget data id
jekyll changed its command "jekyll --server" does not work anymore. The command was replaced with "jekyll serve"
Merge pull request #15 from glaubinix/readme

updated readme
added widget data id
Merge pull request #16 from glaubinix/twitter

fixed #14