Expose firestore query errors

[aaaronMF]

Closes #12.

The code from @sampl was slightly modifed in order for existing tests to pass, and tests were added to ensure that the FirestoreCollection and FirestoreDocument components react accordingly to firestore query errors.

[aaaronMF]

I noticed that tests are failing in the Travis CI build, but they are passing locally for me. Would I be able to get assistance in resolving this?

[sampl]

@aaaronMF thank you so much for jumping on this!

[green-arrow]

@aaaronMF - I pulled down your branch and am seeing the test failures that are in TravisCI locally. When you run yarn test, you will need to make sure all the tests are running by pressing a. Let me know if that works for you!

Also, can we remove the package-lock.json file from this PR?

[codecov]

Codecov Report

Merging #26 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #26   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           6      6           
  Lines          78     80    +2     
  Branches       18     18           
=====================================
+ Hits           78     80    +2

Impacted Files	Coverage Δ
src/FirestoreDocument.js	100% <100%> (ø)	⬆️
src/FirestoreCollection.js	100% <100%> (ø)	⬆️

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[aaaronMF]

Tests are passing now. @warbrett pointed out I should run yarn install instead of using npm to ensure the correct package versions are being used.

[sampl]

What do you think @green-arrow?

[green-arrow]

@aaaronMF @sampl - Sorry for the delay on this. I was on vacation for a couple weeks and been trying to catch back up at work.

Thanks for this PR!

[sampl]

Wooohoooo!! Thanks @green-arrow 😃

🙏🎇🚀🌟