Images added
Merge pull request #23 from dergraf/master

Responsiveness using Twitter Bootstrap
Minor styling tweaks

Reduced margin for page-header, and twitter-button. Changed line-height
von h3-titles.
number of retweets per tweet stored

not used yet, will be used for issue #16 (sort links by popularity)
issue #19: Display author where available
Work started on issue #13 (tooltips)

Still missing: Add tweet embed to tooltip content
Problems with event listener fixed
Work started on issue #18

type of link called from embed.ly to distinguish between links (that we
already deal with) from video and rich (that we treat link links right
now)
close-button tweak
New attempt at issue #13

Still doesn't work, though
Issue #12: Prevent cropping in the middle of a word
viable way for the tooltips, not requesting oembed from the twitter api since we already have the Tweet text
merged