fix #538: use 1 logger

[slimus]

We used 2 different systems for logging.

Now I removed old log system and use one logger everywhere

[codecov-commenter]

Codecov Report

Merging #637 (01526be) into master (9d47494) will decrease coverage by 1.01%.
The diff coverage is 18.18%.

@@            Coverage Diff             @@
##           master     #637      +/-   ##
==========================================
- Coverage   65.05%   64.04%   -1.02%     
==========================================
  Files          21       21              
  Lines        1783     1808      +25     
==========================================
- Hits         1160     1158       -2     
- Misses        562      591      +29     
+ Partials       61       59       -2     

Impacted Files	Coverage Δ
logx/log.go	37.73% <0.00%> (-11.05%)	⬇️
router/server.go	77.32% <100.00%> (+3.55%)	⬆️

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[appleboy]

@slimus Thanks for your effort. Maybe I can improve the gin/logger package not copy the source code from gin/logger.

[slimus]

It would be great :)