Handle thrown errors in promise callbacks

Nobody has claimed this yet.

This [line of code](https://github.com/makeomatic/redux-connect/blob/b4bc64e9b256cced2628ce72dbffa7fdf2cbc5bc/modules/helpers/utils.js#L133) does not catch errors so instead they get lost in the event loop and the component never gets rendered correctly. Additionally, it's hard to catch and display the error in an isomorphic app.

Something like this would reproduce it:
````js
@asyncConnect([{
deferred: true,
promise: () => {
throw new Error('whoops, this was not supposed to happen');
},
}])
class SomeComponent extends React.Component {
...
}
````
It should be fixable like this:
````js
let promiseOrResult;
try {
promiseOrResult = item.promise(rest);
} catch (error) {
promiseOrResult = Promise.reject(error);
}
````

Start in modules/helpers/utils.js at the linked line and trace how item.promise(rest) is handled for deferred async props. Use the provided throwing callback as the reproduction case, then verify that the error reaches the app's rendering or error-handling path instead of being lost in the event loop.

Written by the indexing model from the issue text.