Feat/swagger auth

[Dawn0472]

add swagger authorization

1. add auth button in swagger
2. add auth url to get token (逾7天更新一次，若無token則新增，有token直接取得- one user vs one token)
3. update core.models.Token(預設 one user vs multiple token)
4. update BearerAuthentication function(swagger authorization)
5. update api import BearerAuthentication

[josix]

Hello @Dawn0472, thank you for working on this. There are some coding style issues, could you help me fix it, thanks!

[codecov-commenter]

Codecov Report

❌ Patch coverage is 65.82278% with 27 lines in your changes missing coverage. Please review.
✅ Project coverage is 69.57%. Comparing base (4b520ac) to head (287fc55).
⚠️ Report is 321 commits behind head on master.

Files with missing lines	Patch %	Lines
src/users/api/views.py	36.66%	19 Missing ⚠️
src/core/authentication.py	79.31%	6 Missing ⚠️
src/pycontw2016/urls.py	66.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1141      +/-   ##
==========================================
+ Coverage   69.56%   69.57%   +0.01%     
==========================================
  Files          82       87       +5     
  Lines        3364     3444      +80     
==========================================
+ Hits         2340     2396      +56     
- Misses       1024     1048      +24     

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