animint.js Selectors does not need hasOwnProperty

there are several uses of Selectors.hasOwnProperty which seems to be un-necessary, so should be removed. ``` grep -nH --null Selectors.hasOwnProperty animint.js animint.js:1570: if (Selectors.hasOwnProperty(selector_name)) { animint.js:1866: if(Selectors.hasOwnProperty(selector_name)){ animint.js:2087: if(!Selectors.hasOwnProperty(v_name)){ animint.js:2766: if(Selectors.hasOwnProperty(selector_nam)){ animint.js:2797: }//if(Selectors.hasOwnProperty(selector_nam)) Grep finished with matches found at Tue Nov 25 09:55:05 ```