Fix Add Blank Line After YAML Only Working When YAML Already Exists

[pjkaufman]

Fixes #1188
Relates to #1199

There was an issue with running the Linter rule Add Blank Line after YAML where it was not adding a blank line after the YAML if it was added by say YAML Timestamp. The issue was caused by the YAML being added long after the rule had run. This meant it could not add the blank line. To fix this, the rule needs to run before YAML Timestamp if the YAML is present since there could be a modification that needs to cause a timestamp update. However if there is no YAML frontmatter present, then it can run after YAML Timestamp since it will either create the frontmatter or no frontmatter will exist by the time the Linter's rules run.

There was also a change to make the release compiled version of the plugin be 16.x since that is the minimum version that should be supported by plugins at this time.

There was also a small fix of a typo in a setting's wording.

It also adds a fix to the minification of the styles which was previously not merged due to the gitignore.

Changes Made:

• Fixed a small typo (see Bug: "YAML Timestamp" doesn't consistently update 'last modified' property #1199)
• Adds proper minification for styles.css
• Adds some integration tests for the scenario in question
• Runs Add Blank Line After YAML either before or after YAML Timestamp depending upon the situation in question