New release v.2.0

- Added new datatype: remark
- Added an option to add many declarations to a specific selector
- Added an option to clear all the declarations from a specific selector
- Added a new object that supports HTML inline CSS style
- Added a new method to merge two CSS Object Models
- Added a new property to set a declaration as important
- Changes in parsing CSS Object Model toString()
- Changes in OOP architecture
- Get specific declaration and modify it in InlinedCss() and Selector()
- Code refactored
- Bug fixes