Minify compiled proto files (#17)

[kritzware]

• What kind of change does this PR introduce?
  Minor dependency upgrades and a new task for minifying the compiled proto files. See Optimize package for lambda #17 for the conversation reference.

• What is the current behavior?
  Currently, this library is very large when compiled for NPM deployment. This becomes problematic when using it with serverless environments, such as AWS Lambda or Netlify Functions.

• What is the new behavior (if this is a feature change)?
  I've included a new Make task minify, which compresses the compiled protocol buffer files down. There were also many empty files from the protoc compilation step that weren't required, so they've been deleted as well. The package size is still quite large because of all the compiled protos, but this is a good first step in reducing the overall size.

• Other information:
  This table shows the size savings with this PR:

Module	Before Comp.	Before	After Comp.	After	% Saving
NPM package (npm pack)	2.3Mb	35.5Mb	1.4Mb	16.5Mb	73%
Compiled proto dir	n/a	36.9Mb	n/a	15.5Mb	81.68%