Warning when using select with options < 2

[jpuri]

When I use belle select with number of options < 2 I get this warning in browser console:

'Warning: Failed propType: Invalid undefined children of type object supplied to Belle Select, expected an array. Check the render method of SelectDocumentation.'

Its coz of Line 633, select.jsx:
const error = React.PropTypes.arrayOf(optionOrPlaceholderOrSeparatorPropType).isRequired(props, propName, componentName);

We need to get rid of this arrayOf.

[jpuri]

Another small related issue: if there is no placeholder(which is not highly probable) and no option then select gets broken on the page as

for placeholder or option is missing.

[jpuri]

This has been fixed with PR #148.