Mail verification and password reset

[tiltec]

Integrate support for sending out mails and use it to verify e-mail addresses

Todo:

• make test work (server config missing, no API key)
• write unit & integration test
• setup on fstool.yunity.org (local config file)
• trigger mail verify after mail change
• use email instead of id to request password reset
• change passwords
• check reverification after changing mail address
• include frontend url into mail template for verification
• think about translation support for mail
• nice mail template
• decide if it's worth using a serializer for password reset
• check transaction status of mail
• log password resets to influxdb
• add transifex to project
• decouple the frontend: use a parameter on the password_reset request for the email URL prefix
• consider case: mail is not verified and password reset is triggered

Closes #92

[codecov-io]

Current coverage is 96.34% (diff: 99.64%)

Merging #208 into master will increase coverage by 0.51%

@@             master       #208   diff @@
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  Files            68         70     +2   
  Lines          1631       1860   +229   
  Methods           0          0          
  Messages          0          0          
  Branches         67         76     +9   
==========================================
+ Hits           1563       1792   +229   
  Misses           54         54          
  Partials         14         14          

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[tiltec]

I think this could be merged soon. I will file the remaining tasks as issues :)