~tim/mailchimp3

Tweak the errors listing
Update intro in readme
Fix example call
Add ability to work with 2.0 API
Add more explanation to readme
Update readme for gem install
Fix usage instructions in readme
Fix url for root path
Remove respond_to?
Add support for OAuth2
Update description in readme
Fix class name in gemspec
Rename to MailChimp (with proper capital letters)
Update readme with more realistic ids
Initial commit