[DNM] closes #232 - Arango functions to stop/start server, and create/delete account

[anthonykhoa]

Functions to start and stop a connection to an Arango database, as well as delete and create users from an Arango database, need to be created. These functions are needed before creating the API routes that will call those functions.

This PR will:

• Create a sendFetch helper function to use in the back end.
• In the database/elastic/elastic.js file, sendESRequestis instead replaced with the sendFetch function.
• Create functions to start and stop a connection to a Arango Database
• Create functions to delete and create users on a Arango Database
• Delete all neo4j files

[codecov[bot]]

Codecov Report

Merging #233 into master will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #233   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           12        13    +1     
  Lines          445       481   +36     
  Branches        43        50    +7     
=========================================
+ Hits           445       481   +36     

Impacted Files	Coverage Δ
database/arango/arango.js	100.00% <100.00%> (ø)
database/elasticsearch/elastic.js	100.00% <100.00%> (ø)
lib/sendFetch.js	100.00% <100.00%> (ø)
src/server.js	100.00% <100.00%> (ø)

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