add plain-text message
upgrades rails 4.0.0 to 4.1.4
added js runtime as dependencie
exclude public/cache
fixes bug when tags are empty; closes #260
Merge pull request #261 from ciudadanointeligente/upgrade_to_rails_4.1.4

Merge branch 'upgrade_to_rails_4.1.4' into 'master'
Merge pull request #262 from ciudadanointeligente/master

Merge branch 'master' into 'master-cl'