Postgresql migration

* Change duplicated index names
* Change mysql to pg dependency
* Change database.yml
* Change db/seeds.rb to be compatible
Merge branch 'master' into migrate-to-postgresql
Change travis configuration
Merge branch 'migrate-to-postgresql' of github.com:Soluciones/news_tematica into migrate-to-postgresql

* 'migrate-to-postgresql' of github.com:Soluciones/news_tematica:
  Version change
  now we are using Ruby 2.1.2
  Hound as Rankia and Verema

Conflicts:
	.travis.yml
Use rake db:test:prepare instead of db:migrate

* The migrations are not working properly
Merge branch 'master' into migrate-to-postgresql

* master:
  fixing rspec version
  We want Ruby 1.9 syntax
  new settings

Conflicts:
	news_tematica.gemspec
Merge pull request #37 from Soluciones/migrate-to-postgresql

Migrate to postgresql