Upgrade gem dependencies
Remove configuration moved to devtools
Update spec helper to be similar to other gems
Change markdown to use alternate style
Change gemspec to use singular license and newer axiom
Upgrade gem dependencies
Fix failing specs

* Some changes in axiom caused the specs to fail
Fix rubocop warnings
Add backtracing to rspec failures
Change travis configuration to match other gems
Change flay threshold
Change utility methods to use the Comparable#range method
Change flay threshold
Add axiom-types git repo to Gemfile