Elimina config de asset host para carrierwave
configs PostreSQL as db on every env
removes now useless sqlite3 gem
Csv preview is generated even if headers include different encoding chars
Merge pull request #40 from mxabierto/postgres

PostreSQL as DB on every env
Adds Travis CI initial config
Adds travis CI build status to README
Merge pull request #7 from mxabierto/travis-ci

Travis CI integration
Merge branch 'feature/topics' Plan de Apertura

Conflicts:
	Gemfile
	Gemfile.lock
	db/schema.rb
Added admin authentication for creating users from csv file
Sends welcome email when user is created
Added sidekiq for user account notifications
Changed thin to unicorn server
Added staging and production configuration for action mailer
Added mail initializer