centered copyright text
updates to homepage

https://github.com/mozilla/CSOL-site/issues/116#ref-pullrequest-13402271
updated filter menu and icons
Template and styles for single activity
Merge pull request #252 from andrewhayward/error-handling

Merging error handling, with the caveat that @stenington will fix the tests that this will break.
Merge pull request #250 from coryshaw/master

Template Updates
Be less cavalier about building api endpoint urls
Add basic log info statement for API requests
Allow api origins to have paths.
Add basic logging wrapper for winston to start using.
Connect express.logger to logger module.
Use example.org instead of origin.org juuuuuust to be safe.
Dropping the /v2/ from Open Badger api paths and implicitly expecting it in the configured url.