clear up propTypes

elements/Polyline.js

@@ -3,22 +3,19 @@ import React, {
     PropTypes
 } from 'react-native';
 import Path from './Path';
+import {pathProps} from '../lib/props';
 
 class Polyline extends Component{
     static displayName = 'Polyline';
     static propTypes = {
-        points: PropTypes.oneOfType([PropTypes.string, PropTypes.number]),
-        strokeLinecap: PropTypes.oneOf(['butt', 'square', 'round']),
-        strokeCap: PropTypes.oneOf(['butt', 'square', 'round']),
-        strokeLinejoin: PropTypes.oneOf(['miter', 'bevel', 'round']),
-        strokeJoin: PropTypes.oneOf(['miter', 'bevel', 'round'])
+        ...pathProps,
+        points: PropTypes.string
     };
-    static getPath = props => (`M${props.points.trim().replace(/\s+/g, 'L')}`);
 
     render() {
         return <Path
             {...this.props}
-            d={Polyline.getPath(this.props)}
+            d={`M${this.props.points.trim().replace(/\s+/g, 'L')}`}
         />;
     }
 }