Cleanup our Gemfile - remove un-used gems, add shiny new ones.
Remove Welcome controller, introduce Pages controller (generally used for static pages)
For consistency, rename Events startTime and endTime to starts_at, ends_at
Annotate models
Introduce rspec (and associated gems), create initial set of basic specs
Remove old test directory
Introduce rubocop, a static code analyzer based on the community Ruby style guideline
Cleanup code formatting per ruby style guidelines