fixes gcanti#60 Adds support for Switch into Android

Author: alvaromb

lib/templates/bootstrap/checkbox.js

@@ -1,5 +1,5 @@
 var { React } = require('../../util');
-var { View, Text, SwitchIOS } = React;
+var { View, Text, Switch } = React;
 
 function checkbox(locals) {
 
@@ -24,7 +24,7 @@ function checkbox(locals) {
   return (
     <View style={formGroupStyle}>
       {label}
-      <SwitchIOS
+      <Switch
         ref="input"
         disabled={locals.disabled}
         onTintColor={locals.onTintColor}