Code cleanup for Python, JS

[sumnerevans]

Addresses some of #63 and all of #66. Cleaned up all of the Python and JS code.

[codecov-io]

Codecov Report

Merging #108 into master will decrease coverage by 0.05%.
The diff coverage is 56.93%.

@@            Coverage Diff             @@
##           master     #108      +/-   ##
==========================================
- Coverage   41.02%   40.97%   -0.06%     
==========================================
  Files          39       43       +4     
  Lines        3054     3109      +55     
  Branches        1        1              
==========================================
+ Hits         1253     1274      +21     
- Misses       1801     1835      +34

Impacted Files	Coverage Δ
server/widb_server.py	0% <ø> (ø)	⬆️
server/helpers/util.py	100% <ø> (ø)	⬆️
server/helpers/kajiki_view.py	60% <ø> (ø)
server/controller/sessions.py	27.02% <0%> (ø)	⬆️
server/parsing_lib/android_log_parser.py	0% <0%> (ø)
server/parsing_lib/ios_log_parser.py	0% <0%> (ø)
server/controller/root.py	54.34% <100%> (+8.4%)	⬆️
...r/datastore_interfaces/base_datastore_interface.py	100% <100%> (ø)	⬆️
server/tests/base_datastore_interface_tests.py	100% <100%> (ø)	⬆️
...ver/datastore_interfaces/no_datastore_interface.py	100% <100%> (ø)	⬆️
... and 15 more

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