Remove npm audit warnings and tslint deprecated rule warning

[twindual]

What:

This update fixes: -npm audit warnings -tslint deprecated rule warning -adds a new contributor -adds Google firestore package (to use auth package)

Issue number: N/A

[codecov-io]

Codecov Report

Merging #485 into master will decrease coverage by 0.18%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #485      +/-   ##
==========================================
- Coverage    72.1%   71.92%   -0.19%     
==========================================
  Files          65       65              
  Lines         552      552              
  Branches       34       34              
==========================================
- Hits          398      397       -1     
- Misses        144      145       +1     
  Partials       10       10

Impacted Files	Coverage Δ
...tarter/src/app/core/animations/route.animations.ts	80% <0%> (-10%)	:arrow_down:

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update e2c8e90...61fea3b. Read the comment docs.

[twindual]

Wondering if the codecov/project test failed because of different dependencies, as there were no code changes there?

Any ideas?