Fix typo in features and specs (exists -> exist)

features/actions/mkdir.feature

@@ -13,7 +13,7 @@ Feature: `mkdir' task action
 
   Scenario: creates directory given as argument
     When I successfully execute the recipe on remote target
-    Then the remote directory "some_directory" must exists
+    Then the remote directory "some_directory" must exist
 
   Scenario: creates directory with given attributes
     When I successfully execute the recipe on remote target
@@ -28,4 +28,4 @@ Feature: `mkdir' task action
       end
       """
     When I successfully execute the recipe on remote target
-    Then the remote directory "some/directory" must exists
+    Then the remote directory "some/directory" must exist

features/steps/remote_steps.rb

@@ -16,7 +16,7 @@ Given /^a remote file named "([^"]+)" with "([^"]+)"$/ do |file_name, content|
   write_file file_name, content
 end
 
-Then /^the remote directory "([^"]+)" must exists$/ do |path|
+Then /^the remote directory "([^"]+)" must exist$/ do |path|
   check_directory_presence [path], true
 end
 

spec/producer/core/actions/mkdir_spec.rb

@@ -47,7 +47,7 @@ module Producer::Core
           end
         end
 
-        context 'when parent directories does not exists' do
+        context 'when parent directories does not exist' do
           let(:path) { 'some/path' }
 
           it 'creates parent directories' do