Editable input does not fix number greater than max value

[robertop87]

Description

When paper-slider is editable and it has min, max values:

1. Slide or type the max value possible
2. Insert a number greater than the max value

Expected outcome

The input field fix and round the inserted value to the max value possible

Actual outcome

The input field shows/allows numbers greater than the max value

Steps to reproduce

1. Put a <paper-slider min="0 max=""5 editable> element in the page.
2. With the slider move the value to 5
3. Type 15 in the input.

Current behaviour: The input allows values greater than limit set in max property