[openstreetmap/openstreetmap-website] Add banner for OSMF Membership Drive (#1651)

[Bryan Housel]

This adds a banner for the current OSMF 2017 membership drive.
cc @mikelmaron 

<img width="955" alt="screenshot 2017-10-16 01 25 09" src="https://user-images.githubusercontent.com/38784/31596492-e11895ec-b210-11e7-8fd5-0ca86061d3a0.png">

You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/1651

-- Commit Summary --

  * Add banner for OSMF Membership Drive

-- File Changes --

    A app/assets/images/banners/osmf-membership-drive-2017.png (0)
    M config/banners.yml (6)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/1651.patch
https://github.com/openstreetmap/openstreetmap-website/pull/1651.diff

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