Launch version 0.1.3

`collection` defines an array of ids instead of query through an index

ork.gemspec

@@ -1,6 +1,6 @@
 Gem::Specification.new do |s|
   s.name        = 'ork'
-  s.version     = '0.1.2'
+  s.version     = '0.1.3'
   s.date        = Time.now.strftime('%Y-%m-%d')
   s.summary     = 'Ruby modeling layer for Riak.'
   s.description = 'Ork is a small Ruby modeling layer for Riak, inspired by Ohm.'
@@ -17,8 +17,8 @@ Gem::Specification.new do |s|
   ]
   s.test_files = Dir['test/*.*']
 
-  s.add_dependency 'riak-client'
-  s.add_development_dependency 'protest'
-  s.add_development_dependency 'mocha'
+  s.add_runtime_dependency 'riak-client', '~> 1.4'
+  s.add_development_dependency 'protest', '~> 0'
+  s.add_development_dependency 'mocha', '~> 0'
 end