refactor(async/await): Refactored most runtime promises to async/awai…

[zakhenry]

…t pattern

This project uses semver, please check the scope of this pr:

• [x] #patch# - backwards-compatible bug fix
• [ ] #minor# - adding functionality in a backwards-compatible manner
• [ ] #major# - incompatible API change

[coveralls]

Changes Unknown when pulling c8d3b51e705b67b2064de9ab44a93635993b23eb on chore/refactor-promises-to-async into on master.