Change icon type from Object to String

[fookoo]

Allow to use google-map-marker with icon parameter passed as a string

<google-map-marker icon="/assets/icon.svg"></google-map-marker>

Before change you cant use string directly into tag attribute, you had to pass it as a bind property, like so:

<google-map-marker icon="{{ icon }}"></google-map-marker>

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[fookoo]

I signed it 2017-08-29 23:05 GMT+02:00 googlebot <notifications@github.com>:

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[googlebot]

CLAs look good, thanks!