Run function refactored

[tiagofabre]

Run function now makes less things.

Also getTextFromRequire is being reutilized to avoid this

This pull request is trying to solve #59

• Testes - total: 61 - passing: 61
• The output is the same before and after the modifications
• ESlint

[coveralls]

Coverage increased (+0.6%) to 90.0% when pulling b1eed1d on tiagofabre:refactoring into f03e149 on bucharest-gold:master.

[helio-frota]

@tiagofabre it is looking great, but can you please remove the default parameter from
function run (directory, options = {}) {
since node 4x does not support this.

[coveralls]

Coverage increased (+0.7%) to 90.031% when pulling cdac961 on tiagofabre:refactoring into f03e149 on bucharest-gold:master.

[coveralls]

Coverage increased (+0.7%) to 90.031% when pulling cdac961 on tiagofabre:refactoring into f03e149 on bucharest-gold:master.

[helio-frota]

@tiagofabre thanks !