Added fetching vimeo movies thumbs and return large format
Replaced embeded vimeo player with video thumb and added loading player
on demand
Extracted meetups data into meetups.yaml and load them dynamically
I devided meetup_number into number and date keys and added meetup_title
header
Cleaned up the talk view using by view helpers
Merge pull request #16 from aokon/optimize_archive_view

Optimize archive view