Update gems to use same versions of Rankia.

* pg instead of mysql
* rails 4.1-stable
* tematica 4.0.0
Remove pluck definition.
Add semanal/es inflection.
Change .count to .size

* count doesn't work with select (... as ...)
https://github.com/rails/rails/issues/2541
Use SQL BETWEEN & remove unneeded .to_date
Change travis conf to use postgres
set config.eager_load to false in test environment
Use ruby 2.1.2
Change usuario.estado_id to integer
Add tematica_tematicas migrations
Add tematicas seeds
Use spec expect instead of old should
Remove jQuery from the assets
Add color to rspec
update hound config
DRYing Usuario class
Using pluck instead of map
unhounding longline
Merge pull request #16 from Soluciones/refactor

Refactor
Merge pull request #15 from Soluciones/update-engine

Update engine