Refactor lib/utils.js

[jacobmoretti]

Refactor lib/utils.js by abstracting out each of the functions into separate files and placed under lib:

• getLocation, I believe this was only added to allow easier mocking. We should be able to do away with this and fix the tests that relied on it.
• ldClientWrapper -> ldClientWrapper.js
• ldOverrideFlag -> ldOverrideFlag.js
• getAllFeatureFlags -> getAllFeatureFlags.js

[GarretLefler]

I can help with this.

Is there a quick way to test any changes I make before I submit a pull request?

[jacobmoretti]

@GarretLefler Thanks for offering to lend a hand with this issue! Unfortunately there isn't a great a way to do an end-to-end test without an account with LaunchDarkly. Its also part of the reason why #16 hasn't been completed yet.

Feel free to submit your PR and use the unit-tests as the measurement for now. I'll do some testing of your changes on my end as well.