[openstreetmap-website] Disable automatic gravatar opt-in, as it violates the privacy policy (#519)

Wed Nov 6 10:32:46 UTC 2013

Do not forget about [google's reverse image search](https://www.google.si/search?tbs=sbi:AMhZZitzsHJPy1flaIVpeTCZNNoN2jX_1IgRujXsV-IZTtMqiXxtmQbdrXaFhJM6ZzANuAKauWGi-1qaLMwPrmKldTMByWczrPTrACVBGtxJYdwsldEMCPDsvw840wwd2lw6TuTFnX6oJHIy6300Xam5GJqa1APO_1uVdlZlht2lrkXnEFplvC-HrDRm5rDrKLo_1ZQkHNr7xF5EptIqmZ4vAUexk_1aJ86pmZHW3IK4qrchjyO9cIQSJeheViYtm7zVchyWUwaPPYCPd8SeWRfMfruVmDWdz5nmZAcEJE1WXeI6Q8cKe2aIMm9oF0odwXU3gb_1aVl8KsbNqZVG2Vr6oG5K-bR8iWfVCbo1wWbm1CvQhZU8Dwjtj22GBOsePrfgezIcMiUHhEK5n2ClAGEWqHvcWAWXB7PC3IWGaPga6cNGxBAOrkc-aw1uvjinXNI7Lw-Hj_1CRfAkeIKTpx45GKy26z1lgPK_183_10fj8FUifynMTODQl99846yf-KBNAIAHQzhWUN5xKjRqRlNFoYuGc7WR0oIchEY3kGkPRk1hKNbZMyAgYqKjYVLDYOf3DH2JrqoDEk2jcvwrhBH1j2JWX5kgGw5F7aGOKh6Xz9Ng-DSZ0kQ0Ujg3EwS1gdBrRbea2FlvDvgwWiDk6h3txhvhUQ_1SUttWzsjpcIm6sK4bXqr70a29FfWcZiRRa2x809lyyw97u6sSFdinNv2E8GPSLldjHPDqfGrJtdgD-IPyitEmjAfRNhTRGM_1TgPYXIsj0y3CkuXw9eTdyTRqU58N1utBod8ALUs6jIiSCb9_1suSkUtagQTanbXsUNQfKWn_1fgI6ikQ5B3ay0Cidd0zmoFVdLsU0VoOcNIFmQuD45YBWoKXgbizCk3KkFYsN4HdMJMp
 oRt_1ImdlQTLX7BLeU7lTStLo4bIsILJ3qL7MKytXOeZ-VMM2WvBTM4TFTZhB89AB0iZkbp2mFUDLP3rqu0pDg-g6bpmphNJLBc4rppmUWLP4S54FK-3mLnXC68v9tIFtrS7So4fZcauixFjOqcFIPwnCk7VpCO7p4w3_13bHXfr-YRF5i5PFd3rz_1iDD4mGgAUB2QnieuVaJJ5NZYS7u8BPaeclWq1hHefEtUUtMbpTnjgnx0X5YhOGdnyGzi8ayn59vGPbId25IrStjjheAtvt06S2UBhSKWoH3IAz6rS1yWTVHiLpb0OqlNqUORz_1lOSIMgVY4H2XICivQj5-XxeHnMX6lwawBjXA1rcjlR12f3n8Mz16Ud2ua77NzFXQDN8w5yw3pxiE_1) feature, which would defeat even salted hashes.

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https://github.com/openstreetmap/openstreetmap-website/pull/519#issuecomment-27860789
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