SCSSLint: Add initial config

Moved "scripts" to "script" folder to align with core
SCSSLint: Enforce indenting
SCSSLint: Use double quotes everywhere

Newer node-sass no longer requires our old `unquote` workaround
SCSSLint: Normalize Hex notation for colours

- Fixed `leftlf` typo in views/screen-md-min
- Use `ie-hex-str` for MS gradient fallback like Bootstrap and Compass
SCSSLint: Use property shorthand when available
SCSSLint: Space after property values
SCSSLint: Sort property order
SCSSLint: Add trailing semicolons
SCSSLint: Add space before opening brace
SCSSLint: Merge selectors
SCSSLint: Selectors on separate lines
SCSSLint: Quote URL values
SCSSLint: Sort CSS properties
SCSSLint: Add spaces after blocks
SCSSLint: Add final EOL
SCSSLint: Enforce URL Format rule