outras variaveis podem ser aplicadas usando applyVariables

 Changes to be committed:
	modified:   scripts/config/corpus.yml
	modified:   scripts/events/error.coffee
	modified:   scripts/events/respond.coffee
	modified:   scripts/lib/common.coffee

Resolve "Criar tratamento de erros e grau de confiança"

Closes #5

See merge request !3

 Changes to be committed:
	modified:   scripts/bot/index.coffee
	new file:   scripts/config/corpus.yml
	modified:   scripts/config/model.yml
	new file:   scripts/events/error.coffee
	modified:   scripts/index.coffee

Arquivo de config alterado

See merge request !2

Beta4

See merge request !1