Normalizes abbreviated value to final CSS one
@param {String} value
@returns {String}
function normalizeValue(value) {
		if (value.charAt(0) == '-' && !/^\-[\.\d]/.test(value)) {
			value = value.replace(/^\-+/, '');
		}
		
		if (value.charAt(0) == '#') {
			return normalizeHexColor(value);
		}
		
		return getKeyword(value);
	}