Support for namespace

Release notes: https://github.com/SonarQubeCommunity/sonar-css/issues?q=milestone%3A1.7+is%3Aclosed

• Adds support for namespace
• Fixes the issue on highlighting with UTF-8 encoded files starting with a Byte Order Mark
• Removes the ability to deactivate complexity metrics computation

Two new rules and several bug fixes

Release notes: https://github.com/SonarQubeCommunity/sonar-css/issues?q=milestone%3A1.6

Two new rules:

• Font files inlining should not be used
• BOM should not be used for UTF-8 files

New rule about fontface browser compatibility + Improvements on existing rules

Release notes: https://github.com/SonarCommunity/sonar-css/issues?q=milestone%3A1.5

• New rule: fontface browser compatibility
• New CSS validators
• Several rule improvements and bug fixes

Bug fix version

Release notes: https://github.com/SonarCommunity/sonar-css/issues?q=milestone%3A1.4

• Rule description tweaks
• NPE on rule bulletproof-font-face

CSS validator, new rules, complexity computation

• Adding a bunch of new rules
• Providing a CSS validator
• Computing complexity
• Fixing a few parser issues

Release notes: https://github.com/SonarCommunity/sonar-css/issues?q=milestone%3A1.3