Change IniSettingsFile unit tests to be non-destructive - Fixes #22

[PlagueHO]

Pull Request (PR) description

This PR corrects unit tests to make sure they're not destructive. It also opts in to additional common tests and updates to the new MIT license format.

This Pull Request (PR) fixes the following issues

• Fixes Remove TestFile.txt From Repo #22

Task list

• Added an entry under the Unreleased section of the change log in the CHANGELOG.md.
  Entry should say what was changed, and how that affects users (if applicable).
• Resource documentation added/updated in README.md in resource folder.
• Resource parameter descriptions added/updated in schema.mof
  and comment-based help.
• Comment-based help added/updated.
• Localization strings added/updated in all localization files as appropriate.
• Examples appropriately added/updated.
• Unit tests added/updated. See DSC Resource Testing Guidelines.
• Integration tests added/updated (where possible). See DSC Resource Testing Guidelines.
• New/changed code adheres to DSC Resource Style Guidelines and Best Practices.

@johlju - would you mind reviewing for me? I just want to get this one out before I release to the PS Gallery.

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This change is 

[codecov]

Codecov Report

Merging #23 into dev will not change coverage.
The diff coverage is n/a.

@@        Coverage Diff        @@
##           dev   #23   +/-   ##
=================================
  Coverage   91%   91%           
=================================
  Files        5     5           
  Lines      246   246           
=================================
  Hits       224   224           
  Misses      22    22

[johlju]

Reviewed 6 of 6 files at r1.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @PlagueHO)

[PlagueHO]

Thank you @johlju !!!!

[johlju]

@PlagueHO Your welcome! 😃 Hoping the publishing will work as expected. 😉

[PlagueHO]

@johlju - We will see 😁 I've hooked up my gallery_api environment variable in AppVeyor so fingers crossed!