Returns true if `BEM.DOM.decl` AST node has
static methods declaration.
@param {Object} node AST node of BEM.DOM.decl`
@return {Boolean}
function hasStatic(node) {
    var args = node.arguments;
    if (!args) {
        return false;
    }
    return args.length >= 3 &&
        args[1].type === "ObjectExpression" &&
        args[2].type === "ObjectExpression";
}