A few minor bug fixes

[amoodie]

A few minor bug fixes:

• init_sediment_routers() is called after changing time_step property
• fix path finding to be platform agnostic in init_tools.init_logger
• fix a labeling error in documentation for output file

[codecov[bot]]

Codecov Report

Merging #235 (96ebd85) into develop (ecba7ca) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop     #235   +/-   ##
========================================
  Coverage    78.68%   78.69%           
========================================
  Files           12       12           
  Lines         2576     2577    +1     
========================================
+ Hits          2027     2028    +1     
  Misses         549      549           

Impacted Files	Coverage Δ
pyDeltaRCM/_version.py	100.00% <100.00%> (ø)
pyDeltaRCM/init_tools.py	97.10% <100.00%> (ø)
pyDeltaRCM/model.py	89.42% <100.00%> (+0.01%)	:arrow_up:

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