Change the copyright info to be variables

[DonFruendo]

Changed the flask_user_layout.html template to use variables from the user_manager_settings.py file instead of hardcoding "2014 MyCorp"

[codecov-io]

Codecov Report

Merging #280 into master will decrease coverage by 2.04%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #280      +/-   ##
==========================================
- Coverage   90.62%   88.57%   -2.05%     
==========================================
  Files          25       25              
  Lines        1450     1453       +3     
==========================================
- Hits         1314     1287      -27     
- Misses        136      166      +30

Impacted Files	Coverage Δ
flask_user/user_manager__settings.py	100% <100%> (ø)	⬆️
flask_user/db_adapters/mongo_db_adapter.py	35% <0%> (-60%)	⬇️
flask_user/db_manager.py	82.81% <0%> (-4.69%)	⬇️

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[DonFruendo]

So I added the USER_APP_VERSION variable to the user_settings to also be able to change this.

[and-semakin]

Thank you for your contribution @DonFruendo!