Fixed / Extended Logging

[fighterii]

This PR should fix issue #1140 .

The api.logger is no longer overwritten by set_user method to a new logger without any handlers/formatters/loglevels.

Furthermore it extends the configuration option for logging by introducing two new arguments for API and Bot (loglevel_file and loglevel_stream).

The defaults are the old values (DEBUG for stream; INFO for file) to preserve existing behavior. In my opinion this doesnt make sense, I'd expect the default to be the other way round (less output in the console; more for debugging in the file), but for backwards compatibility I didn't change that.

[codecov-io]

Codecov Report

Merging #1205 into master will not change coverage. The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #1205   +/-   ##
=======================================
  Coverage   43.61%   43.61%           
=======================================
  Files          32       32           
  Lines        3572     3572           
  Branches      580      580           
=======================================
  Hits         1558     1558           
  Misses       1872     1872           
  Partials      142      142

Impacted Files	Coverage Δ
instabot/bot/bot.py	77.17% <100%> (+0.04%)	:arrow_up:
instabot/api/api.py	50.32% <100%> (-0.06%)	:arrow_down:

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[ohld]

Thanks for great fix1

[ohld]

!!!