Better validation for sponsor websites: use input type='url' on the sponsor form, and validate the format in the model.
Test new validations on Sponsor model, and make sure that Fabricate produces valid Sponsor models for other tests.
Merge pull request #145 from creature/website-validation

Better validation for sponsor websites.
reword and add id
don’t use scope for next_spot as it returns
relationship when there is no match
Merge pull request #146 from despo/master

tweaks
remove space
add presenters for different types of events
to simplify views
add ChapterPresenter 
and twitter details to chapter
Add attendance policy
Link to attendance policy from new member page
and reword text
add local chapter page
update event and dashboard pages to use new event partial
Merge pull request #147 from despo/show-local-chapters

Show local chapters
remove empty strings
link to past events, if there are no upcoming events
restrict sponsor logo height
improve chapter page responsiveness
update background image
update invitation and emails to show workshop
organisers