Add support for more rubies

Support added for the following implementations:
  * Ruby MRI 1.9.2
  * JRuby (1.9 mode)
  * Rubinius (1.9 mode)

.gitignore

@@ -15,3 +15,4 @@ spec/reports
 test/tmp
 test/version_tmp
 tmp
+.rbx

.travis.yml

@@ -1,3 +1,6 @@
 language: ruby
 rvm:
   - 1.9.3
+  - 1.9.2
+  - jruby-19mode
+  - rbx-19mode

hovercraft.gemspec

@@ -19,11 +19,14 @@ Gem::Specification.new do |gem|
   gem.require_paths = ['lib']
   gem.version       = Hovercraft::VERSION
 
-  gem.add_dependency 'sinatra-activerecord'
-  gem.add_dependency 'rack-contrib'
+  gem.required_ruby_version = '>= 1.9.2'
 
-  gem.add_development_dependency 'rspec'
+  gem.add_dependency 'sinatra-activerecord', '~> 1.1.0'
+  gem.add_dependency 'rack-contrib', '~> 1.1.0'
+  gem.add_dependency 'json', '~> 1.7.3'
+
+  gem.add_development_dependency 'rspec', '~> 2.11.0'
+  gem.add_development_dependency 'rack-test', '~> 0.6.1'
   gem.add_development_dependency 'pry'
   gem.add_development_dependency 'rake'
-  gem.add_development_dependency 'rack-test'
 end

lib/hovercraft/builder.rb

@@ -2,7 +2,7 @@
 require 'hovercraft/routes'
 require 'hovercraft/helpers'
 require 'sinatra/base'
-require 'rack/contrib'
+require 'rack/contrib/post_body_content_type_parser'
 require 'forwardable'
 
 module Hovercraft