Add the latest stable ORM versions to the build matrix

gemfiles/active_record/4-1.gemfile

@@ -0,0 +1,13 @@
+source "https://rubygems.org"
+
+gem "activerecord", "~> 4.1.0"
+
+gemspec name: "periscope-activerecord", path: "../../"
+
+group :test do
+  gem "database_cleaner", "~> 1.0.1"
+  gem "factory_girl", "~> 4.2"
+  gem "rake", "~> 10.1"
+  gem "rspec", "~> 2.14"
+  gem "sqlite3", "~> 1.3"
+end

gemfiles/mongo_mapper/0-13.gemfile

@@ -0,0 +1,13 @@
+source "https://rubygems.org"
+
+gem "mongo_mapper", "~> 0.13.0"
+
+gemspec name: "periscope-mongo_mapper", path: "../../"
+
+group :test do
+  gem "bson_ext", "~> 1.9"
+  gem "database_cleaner", "~> 0.9"
+  gem "factory_girl", "~> 4.2"
+  gem "rake", "~> 10.1"
+  gem "rspec", "~> 2.14"
+end

gemfiles/mongoid/4-0.gemfile

@@ -0,0 +1,12 @@
+source "https://rubygems.org"
+
+gem "mongoid", "~> 4.0.0"
+
+gemspec name: "periscope-mongoid", path: "../../"
+
+group :test do
+  gem "database_cleaner", "~> 0.9"
+  gem "factory_girl", "~> 4.2"
+  gem "rake", "~> 10.1"
+  gem "rspec", "~> 2.14"
+end

periscope-mongoid.gemspec

@@ -10,7 +10,7 @@ Gem::Specification.new do |gem|
   gem.homepage = "https://github.com/laserlemon/periscope"
   gem.license  = "MIT"
 
-  gem.add_dependency "mongoid", ">= 2", "< 4"
+  gem.add_dependency "mongoid", ">= 2", "< 5"
   gem.add_dependency "periscope", "~> 2.1.0"
 
   gem.files = %w(