Server cleanup

[3ygun]

Goals

Cleanup the server enhancing process understanding and option editing. Enabled through refractoring into functions and a configuration.json file.

Parts

• [x] Remove duplicate crowdML-server-Android.js file
• [x] Refractor crowdML-server.js to:
  • Use functions for improved readibility and findability
  • Preform the configuration validation check
  • Use the new configuration.json discussed below
• [x] Refractor Constants.js into config/configuration.json
  • Why? Look at the difference between the goal and the current implementation
    • Goal: File with the tunable CrowdML parameters
    • Previous Impl: Parameters and validation
    • ^ Therefore we don't have a seperation of concerns. Additionally, This data is needlessly reassigned to different values in crowdML-server.js which can be solved by having master config object which is initialized to the values of configuration.json and modified from there.
    • Current Impl: Parameters only (valication extracted to the server.js itself).
• [X] Updated readme.md imformation to improve readability and refresh supported opperations

Remaining Problems

\/ Extracted to #20 \/

• [ ] ~Need to do some further testing to affirm I didn't break anything~
• [ ] ~Extract Firebase config to allow ENV's instead of committing credential information~
• [ ] ~Remove duplicate loading of configuration in tests~
• [x] Review from @tyllermzeller

[3ygun]

@tylermzeller let me know if you think this is a "good" direction and from there I'll complete the remaining issues.

[tylermzeller]

This is long overdue. Good work. I'm going to merge it when I get home. My only remaining concern is why there was a duplicate server file in the first place. I had just assumed it needed to be different from the iOS server file, but that's something we will need to ask Jihun.