Remove dependency on bluebird and corejs

[haimlit]

Is it possible to drop the bluebird and corejs dependencies? They weight quite a lot. react-here-maps is the project using bluebird among my dependencies, and webpack uses another version of core-js than bluebird, so I get this dependency bundled twice. I think it should be the consumer's choice if to use polyfills or not, and webpack usually fills that role sufficiently.

[Josh-ES]

Understood, I'll investigate making the changes. I believe core-js might be able to be moved to a development dependency, but bluebird might require more investigation.

[schtauffen]

core-js in particular has cost our team a few days of issues before we determined the cause. Please either

1. remove dependency on core-js altogether and let people polyfill as necessary
2. import namespaced polyfills that do not affect the global scope:

import * as Map from 'core-js/library/fn/map'

In addition to preventing errors with other libraries, core-js is like 500 modules which everyone shouldn't be forced to bundle.