Add dummy app, rspec helper files, and routing tests

calligraphy.gemspec

@@ -13,10 +13,13 @@ Gem::Specification.new do |s|
   s.homepage    = 'http://www.github.com/eanlain/calligraphy'
   s.license     = 'MIT'
 
+  s.required_ruby_version = ">= 2.2.2"
+
   s.files       = Dir['lib/**/*', 'LICENSE', 'README.md']
   s.test_files  = Dir['spec/**/*']
 
   s.add_dependency 'rails', '~> 5.0'
 
-  s.add_development_dependency 'rspec'
+  s.add_development_dependency 'rspec-rails', '~> 3.7.2'
+  s.add_development_dependency 'sqlite3', '~> 1.3.13'
 end