Fix Gem::Package::TooLongFileName error.

- Move blocks migrations to dummy app to fix Gem::Package::TooLongFileName error on gem building.
- Fix DestroyNoCmsPagesBlocks migration.
- Update readme.

README.md

@@ -23,6 +23,7 @@ bundle install
 And then import all the migrations:
 
 ```
+rake no_cms_blocks:install:migrations
 rake no_cms_pages:install:migrations
 ```
 

db/migrate/20141211224348_destroy_no_cms_pages_blocks.rb

@@ -1,15 +1,15 @@
 class DestroyNoCmsPagesBlocks < ActiveRecord::Migration
   def change
 
-    if !defined?(NoCms::Blocks::Block) || !NoCms::Blocks::Block.table_exists?
-      raise Exception.new("Migration destroying no_cms_pages_blocks should only be run after creating NoCms::Blocks::Block table")
+    if NoCms::Blocks::Block.table_exists?
+      begin
+        Rake::Task["no_cms:pages:migrate_blocks"].invoke
+      rescue
+        Rake::Task["app:no_cms:pages:migrate_blocks"].invoke
+      end
     end
 
-    begin
-      Rake::Task["no_cms:pages:migrate_blocks"].invoke
-    rescue
-      Rake::Task["app:no_cms:pages:migrate_blocks"].invoke
-    end
     drop_table :no_cms_pages_blocks
+
   end
 end

spec/dummy/db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20150909142454) do
+ActiveRecord::Schema.define(version: 20150910163025) do
 
   create_table "no_cms_blocks_block_translations", force: true do |t|
     t.integer "no_cms_blocks_block_id"