[foundation] Pin google maps version to v3.31 as v3.32 is troublesome

[robvandenbogaard]

If left as is at v3 it will try to use v3.32 resulting in the following error:

js?key=…&language=nl&v=3:40 Uncaught TypeError: Cannot read property 'removeChild' of null
    at MarkerLabel_.onRemove (scripts.min~49189727.js:1936)
    at qu.ug (overlay.js:4)
    at su (overlay.js:1)
    at Object.xk (overlay.js:5)
    at js?key=…language=nl&v=3:146
    at Object._.S (js?key=…&language=nl&v=3:62)
    at MarkerLabel_._.ag.map_changed (js?key=…language=nl&v=3:146)
    at Lc (js?key=…&language=nl&v=3:51)
    at MarkerLabel_._.m.set (js?key=…language=nl&v=3:120)
    at MarkerLabel_.setMap (js?key=…&language=nl&v=3:54)

Also see googlemaps/v3-utility-library#393