Create Gemfile based on gemspec to make it easier to work with dependencies
Add rspec-given for tests
Some simple tests and added dependencies.
As a learning exercise, I tried to create some tests. Since this gem did not declare any dependencies, some things broke... I fixed the best I could
Removing WithIndifferentAccess by now.
I don't think the benefits justify depending on ActiveSupport yet (potential conflict with the version provided by Rails). Maybe hashie?