Port grunt-favicons
Removed Grunt compatibility
Linting fixes
Removed old / unnecessary options
More rewriting and cleaning, found HTML error
Merged background colours, more cleanup
Fixed writing HTML, cleanup
Fixed Firefox icons and manifest, cleanup
Fixed HTML layout, generate HTML regardless
Using array instead of multi-line strings, cleanup
Sort options, enable all by default, better names
Fixed dependencies
Remove files by default
Synchronous unlink
Remove tabs and global variables, last cleanup
Added callbacks, fixed backgrounds
Updated readme, editorconfig and test
Updated package.json
Check if temp files exist before removing
Potential fix for unlink issue