[openstreetmap/openstreetmap-website] Dressed up notification mails (#1401)

[trigpoint]

@saintamh Those look a lot better. They are readable on my phone without zoom. I like it, thank you.
![screenshot-17-02-11-01-33-00](https://cloud.githubusercontent.com/assets/8437076/22849954/91c8cf58-effa-11e6-9b68-33f46ae0d42d.png)
![screenshot-17-02-11-01-34-26](https://cloud.githubusercontent.com/assets/8437076/22849953/91c6f1ba-effa-11e6-86b5-3cdee1b77ea8.png)



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