lint: add tslint to the project

[vcapretz]

Description

As we were using eslint for linting TypeScript files, this commit introduces tslint to the project

The tslint.json file contains the rules and extends the airbnb style guide adapted for tslint

The npm run lint command now run both eslint and tslint

Some variable names weren't changed as they are exported and used in many different files

it closes #208

Your checklist for this pull request

:rotating_light: Please review this items for a good pull request. :four_leaf_clover:

1. I've read the project's Contributing Guidelines
2. My commits are well written and follow pagarme/git-style-guide
3. My changes are well covered by tests and logs
4. I've updated the project docs (if needed)
5. I fell safe about this implementation
6. I feel confortable with the code I wrote, and I'm not ashamed to show it to my friends

In a good pull request, everything above is true :relaxed:

[vcapretz]

@grvcoelho

[GitCop]

There were the following issues with your Pull Request

• Commit: cad345c113d93f0b4f8182aa96762e63cbace217
  • Your commit message body contains a line that is longer than 72 characters
  • Commits must be in the following format: %{scope}: %{description}
  • Your subject line is longer than 72 characters

Check out our Git Style Guide here: https://github.com/pagarme/git-style-guide

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[GitCop]

There were the following issues with your Pull Request

• Commit: a71554535efdf63c0e394c7059416049e589ef88
  • Your commit message body contains a line that is longer than 72 characters
  • Your subject line is longer than 72 characters

Check out our Git Style Guide here: https://github.com/pagarme/git-style-guide

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[vcapretz]

@grvcoelho @marquinhoalm done! :D

[vcapretz]

@grvcoelho deixei então superbowleto e minimizei apenas o stage mesmo! com a apikey passada do limite, coloquei o tslint:disable no começo do arquivo

[marquinhoalm]

@vcapretz Parabéns pelo PR!

[grvcoelho]

@vcapretz: obrigado pelo PR :)