Adds unit (px) to minWidth attribute

Author: Ian Witherow

src/Select.js

@@ -665,7 +665,7 @@ const Select = React.createClass({
 						onBlur={this.handleInputBlur}
 						onChange={this.handleInputChange}
 						onFocus={this.handleInputFocus}
-						minWidth="5"
+						minWidth="5px"
 						ref="input"
 						required={this.state.required}
 						value={this.state.inputValue}