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Mark HTML coverage report's files as eslint-ignore (#212)

Istanbul's HTML coverage reports go in the `coverage` subdirectory of a
project by default, which means they'll be picked up by a project's
tooling (such as ESLint).

This can cause unwanted behavior, such as ESLint appearing to lock up
from trying to process Istanbul's minified third-party JavaScript:

https://github.com/eslint/eslint/issues/10239#issuecomment-389288730

The correct fix is for projects that use Istanbul's HTML reports to
correctly configure their tooling to exclude the `coverage` directory
(for example, by adding `coverage/*` to `.eslintignore`).  However, it's
easy for Istanbul to help accommodate tooling by adding appropriate
comments to its coverage report files, telling tools to skip them.

This PR adds support for optionally prepending headers when copying
files and uses that to mark coverage JS files with
`/* eslint-disable */`.

969 of 1161 branches covered (83.46%)

Branch coverage included in aggregate %.

2379 of 2610 relevant lines covered (91.15%)

121.95 hits per line