Add HTML exporting feature for reports

[mster]

See: https://github.com/nodesource/process/issues/36

Description: Allows for users to generate and export a NCM project report in HTML (as per customer request).

• Report contains project information similar to the --long report.
• Users can specify the location and filename when exporting via --html path/to/report.html (default exports to cwd with a timestamped report name).

TODO:

• [x] Implementation approval
• [x] Determine & implement design
• [ ] Add tests

Screenshot(s): a very ugly duckling

[mster]

Changes completed as per your review @edsadr

[mster]

Updated Example Screenshot:

[mster]

Filtering now supported.

(and depending on security vulnerability level, as the cli does)

[mster]

Reflection of changes