Enables RSpec/ExampleWording and fixes all issues

Both avoiding 'should' and repiting 'it' on the tests description
improves reading them and also makes all descriptions consistent.

Read about cop at http://www.rubydoc.info/gems/rubocop-rspec/RuboCop/Cop/RSpec/ExampleWording

spec/shared/models/map_validations.rb

@@ -12,21 +12,21 @@ shared_examples "map validations" do
      Setting["feature.map"] = nil
     end
 
-    it "should be valid with a map location" do
+    it "is valid with a map location" do
      mappable.map_location = build(:map_location)
      mappable.skip_map = nil
 
      expect(mappable).to be_valid
     end
 
-    it "should be valid accepting that the mappable has no map" do
+    it "is valid accepting that the mappable has no map" do
      mappable.skip_map = "1"
      mappable.map_location = nil
 
      expect(mappable).to be_valid
     end
 
-    it "should be valid when the feature map is deactivated" do
+    it "is valid when the feature map is deactivated" do
      Setting["feature.map"] = nil
 
      mappable.map_location = nil
@@ -35,14 +35,14 @@ shared_examples "map validations" do
      expect(mappable).to be_valid
     end
 
-    it "should not be valid without a map location" do
+    it "is not valid without a map location" do
      mappable.map_location = nil
      mappable.skip_map = nil
 
      expect(mappable).to_not be_valid
     end
 
-    it "should not be valid without accepting that the mappable has no map" do
+    it "is not valid without accepting that the mappable has no map" do
      mappable.skip_map = nil
 
      expect(mappable).to_not be_valid
@@ -52,7 +52,7 @@ shared_examples "map validations" do
 
   describe "cache" do
 
-    it "should expire cache when the map is updated" do
+    it "expires cache when the map is updated" do
       map_location = create(:map_location)
       mappable.map_location = map_location
       mappable.save