* Improve emoteevBidAdapter

** Squash several pending changes

- Improve test coverage
- Extreme programming: 100% test coverage
- Document important constants
- Extreme programming: document all functions
- Imperative shell, functional core
- Send events onBidWon and onTimeout
- Report GDPR relevance and consent

Code documentation uses JSDoc tags wherever possible. See the
following link for general explanation of the notation used:
https://github.com/google/closure-compiler/wiki/Annotating-JavaScript-for-the-Closure-Compiler

** Test coverage

- 100% Statements 110/110
- 100% Branches 55/55
- 100% Functions 28/28
- 100% Lines 99/99

** Integration tests

Tested against production endpoint with the possible combinations of
these following parameters:

- Browser:
  · Chrome Canary 75.0.3739.0
  · Firefox Developer Edition 67.0b3 (64-bit)
  · Safari version 12.0.3 (14606.4.5)
  · Tor Browser 8.0.6 (based on Mozilla Firefox 60.5.1esr)
- Integration page:
  · integrationExamples/gpt/hello_world_emoteev.html
  · https://jsfiddle.net/8aqotw1k/6/

Localhost test server launched with:
$ npm install && gulp serve

* Tentative CI fix for IE and Edge webGL test

https://circleci.com/gh/prebid/Prebid.js/2052

* Tentative CI fix for IE and Edge webGL test #2

* Give up on webGL tests

Has anybody an idea to make it pass?

https://circleci.com/gh/prebid/Prebid.js/2056

New test coverage:

- 94.5% Statements 103/109
- 98.18% Branches 54/55
- 100% Functions 28/28
- 93.88% Lines 92/98

* Avoid useless noice in diff

* Remove unallowed metric pixel ON_ADAPTER_CALLED