Update mongoid dependency

Gemfile.lock

@@ -9,15 +9,15 @@ PATH
 GEM
   remote: http://rubygems.org/
   specs:
-    activemodel (3.0.7)
-      activesupport (= 3.0.7)
+    activemodel (3.0.9)
+      activesupport (= 3.0.9)
       builder (~> 2.1.2)
       i18n (~> 0.5.0)
-    activesupport (3.0.7)
+    activesupport (3.0.9)
     bson (1.3.1)
     bson_ext (1.3.1)
     builder (2.1.2)
-    database_cleaner (0.6.6)
+    database_cleaner (0.6.7)
     diff-lcs (1.1.2)
     fast-stemmer (1.0.0)
     i18n (0.5.0)
@@ -28,18 +28,18 @@ GEM
       mongo (~> 1.3)
       tzinfo (~> 0.3.22)
     rake (0.8.7)
-    rspec (2.5.0)
-      rspec-core (~> 2.5.0)
-      rspec-expectations (~> 2.5.0)
-      rspec-mocks (~> 2.5.0)
-    rspec-core (2.5.1)
-    rspec-expectations (2.5.0)
+    rspec (2.6.0)
+      rspec-core (~> 2.6.0)
+      rspec-expectations (~> 2.6.0)
+      rspec-mocks (~> 2.6.0)
+    rspec-core (2.6.4)
+    rspec-expectations (2.6.0)
       diff-lcs (~> 1.1.2)
-    rspec-mocks (2.5.0)
+    rspec-mocks (2.6.0)
     simplecov (0.4.2)
       simplecov-html (~> 0.4.4)
     simplecov-html (0.4.5)
-    tzinfo (0.3.27)
+    tzinfo (0.3.29)
 
 PLATFORMS
   ruby

mongoid_search.gemspec

@@ -13,8 +13,8 @@ Gem::Specification.new do |s|
 
   s.required_rubygems_version = ">= 1.3.6"
 
-  s.add_dependency("mongoid", ["~> 2.0.0"])
-  s.add_dependency("bson_ext", ["~> 1.2"])
+  s.add_dependency("mongoid", [">= 2.0.0"])
+  s.add_dependency("bson_ext", [">= 1.2"])
   s.add_dependency("fast-stemmer", ["~> 1.0.0"])
 
   s.add_development_dependency("database_cleaner", ["~> 0.6.4"])