Issue List Command
Added issue type option
Some Refactoring

- Renames `issues` to `issue` in command names
- Refactored the assignation of enum variables
- Moved the enum logic to the BAseCommand
- Renamed the commands to reflect the command names
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Merge pull request #54 from cordoval/issue-list-command

[RFR] Issue List Command
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v -> value naming convention fix
stabilizing github-api library
refactor sample for table logic
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Merge pull request #62 from cordoval/refactorTable

tabulator refactor sample
fix way to install with composer global
some more preliminary refactor
bit more of refactor
address comments
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Merge pull request #63 from cordoval/more-refactor

some more refactor of the other commands
[POC] Expectation based TestHttpClient
Changed TestHttpClient method names and added unit test
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