configure by setting environment variables

see readme for details
add mongo uri to readme
cache index page using play builtin cache
do not cache meetings in mongodb
clean code
fix meetup group id key and filter out dojo events
update readme
Merge branch 'master' of git://github.com/lsug-dojo/lsug-website into rsvp-button
travis: update play url
incomplete: travis test
travis: set env variables
incomplete: pass travis tests
use MockMeetingService for tests
display event date next to rsvp button
test rendering of template
testing testing

db connection is still required
extract formatting of dates
use meetup id for http://lsug.org in config
remove println
update readme