Allow passing options to request-promise-native; Revisit defaults

[chadxz]

Right now all requests are made through request-promise-native using default configuration. A consumer of this library may want to customize its behavior for things like disabling rejectUnauthorized, enabling resolveWithFullResponse, disabling simple, etc.

May also want to re-visit the decisions made around the defaults for these options.

[chadxz]

Another consideration is anything special sent to asterisk via headers. Is there anything like that ever?

[chadxz]

talked to Sam about this last week. Would be really easy to add a requestOptions to each api constructor, and Object.assign({}, requestOptions, { ... }) to merge the passed options with the options set explicitly in the constructor.

[chadxz]

working on this in https://github.com/chadxz/awry/tree/38-request-options

[chadxz]

The above branch is no longer relevant because we've migrated from request to axios. The concerns in this ticket are still relevant even when using axios, though. Leaving this open for now.