Refactoring

- Moved slugifier to text helper
- Refactored issue list enums to GitHubHelper
Merge pull request #137 from cordoval/refactoring

This PR was merged into cordoval:master branch.

Discussion
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[WIP] Refactoring

| Q             | A   |
| ---           | --- |
| Bug fix?      | no  |
| New feature?  | no |
| BC breaks?    | no  |
| Deprecations? | no  |
| Tests pass?   | no |
| Fixed tickets |  |
| License       | MIT |
| Doc PR        | na  |

This PR is trying to factor out the common logic and tidy stuff up.

Note that the last commit is a failed attempt to refactor the enum validator logic, need to do that again.

@danielcsgomes does what I have done to the slugifier make sense to you?

Commits
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031744555a0ba21903d8aa4494722478d9b21bf1 Refactoring

- Moved slugifier to text helper
- Refactored issue list enums to GitHubHelper dantleech