Postgresql migration

* Change mysql to pg dependency
* Change database.yml
Merge branch 'master' into migrate-to-postgresql

Conflicts:
	suscribir.gemspec
Change travis configuration
Merge branch 'master' into migrate-to-postgresql

* master:
  Cambio de version
  unhounding quotes
  Warnings removed:
  Better explanation of what I'm testing
  It's a module, not a decorator -> its name shouldn't be SuscribibleDecorator, but Decorators::Suscribible
  hound, don't fuck us with schema!!
  Migration files belong to engine, and not to the dummy app
  added suscribible_decorator and newsletter_decorator, with the method param_key
  Created Newsletter as a Suscribible
  We want Ruby 1.9 syntax
  new settings
Merge branch 'master' into migrate-to-postgresql

* master:
  Cambio de version
  Added factory for newsletter
Merge pull request #22 from Soluciones/migrate-to-postgresql

Migrate to postgresql