Riot-compiler v2.3.20

• Fix riot#1495 : Warning of input tag value - Avoids warnings for date/datetime/time/month/email/color types with expression in its value.
• Fix riot#1488 : Cannot read property 'replace' of undefined when compiling in Node a tag with an import in its less stylesheet -- Thanks to @jrx-jsj
• Fix riot#1448 : Riot compiler parses and removes content from string declaration. This is partial fix, you need to write <\/script> for closing script tags within quoted strings.
• Revised regex that matches <pre> tags.
• @import directives of stylus, sass, scss, and less can be relative to the file being processed.
• Fixed lint issues with new .eslintrc.yml, almost compatible with JavaScript Standard Style